FujiFilm SX Series User manual

BL00005058-200
Surveillance Camera
FUJIFILM SX801
Owner’s Manual: Stand-Alone Mode

ii
Table of Contents
Safety Precautions 1
For Your Safety..............................................................................................................................................................................1
4WARNINGS.........................................................................................................................................................................................................................1
4CAUTIONS..........................................................................................................................................................................................................................1
General Precautions.............................................................................................................................................................................................................1
NOTICES 2
Caution:........................................................................................................................................................................................................................................2
FCC Warning:............................................................................................................................................................................................................................2
For Customers In Canada .................................................................................................................................................................................................2
About the Icons......................................................................................................................................................................................................................2
Disposal of Electrical and Electronic Equipment in Private Households In the European Union, Norway, Iceland
and Liechtenstein:.................................................................................................................................................................................................................3
Precautions for Use 4
Operating Environment...............................................................................................................................................................4
Installation ....................................................................................................................................................................................4
Use..................................................................................................................................................................................................4
Network Settings..........................................................................................................................................................................4
Introduction 5
Parts of the Camera......................................................................................................................................................................5
The Control Panel..................................................................................................................................................................................................................5
Installation and Connection 6
Installation ....................................................................................................................................................................................6
Screw Hole Specications................................................................................................................................................................................................6
Connection Schematic.................................................................................................................................................................7
Operating Mode Selection: DIP Switches ..................................................................................................................................7
Connecting to a Monitor..............................................................................................................................................................8
Camera Controls 9
Basic Setup 10
Choosing a Language and Setting the Clock ......................................................................................................................... 10
Memory Card Warning.............................................................................................................................................................. 11

iii
Table of Contents
Camera Menus 12
Using the Menus........................................................................................................................................................................ 12
SHOOTING MENU 1.................................................................................................................................................................... 14
FOCUS........................................................................................................................................................................................................................................ 14
IRIS................................................................................................................................................................................................................................................ 14
SHUTTER SPEED................................................................................................................................................................................................................... 14
GAIN............................................................................................................................................................................................................................................ 15
DAY/NIGHT ............................................................................................................................................................................................................................. 15
EXTERNAL TRIGGER ........................................................................................................................................................................................................... 15
IR WAVELENGTH................................................................................................................................................................................................................... 16
SHOOTING MENU 2.................................................................................................................................................................... 17
IMAGE STABILIZATION...................................................................................................................................................................................................... 17
SHOOTING MENU 3.................................................................................................................................................................... 18
OPTICAL FILTER(VLC)........................................................................................................................................................................................................ 18
WDR ............................................................................................................................................................................................................................................ 18
BACKLIGHT CORRECTION.............................................................................................................................................................................................. 18
HEAT HAZE REDUCTION................................................................................................................................................................................................. 18
FOG REDUCTION ................................................................................................................................................................................................................ 18
NOISE REDUCTION............................................................................................................................................................................................................. 18
DIGITAL ZOOM ..................................................................................................................................................................................................................... 18
SHOOTING MENU 4.................................................................................................................................................................... 19
USE SETTING.......................................................................................................................................................................................................................... 19
BRIGHTNESS........................................................................................................................................................................................................................... 19
CONTRAST............................................................................................................................................................................................................................... 19
SATURATION........................................................................................................................................................................................................................... 19
SHARPNESS............................................................................................................................................................................................................................. 19
WHITE BALANCE.................................................................................................................................................................................................................. 19
SHOOTING MENU 5.................................................................................................................................................................... 20
DAY & TIME DISPLAY ......................................................................................................................................................................................................... 20
TITLE DISPLAY........................................................................................................................................................................................................................ 20
EDIT TITLE................................................................................................................................................................................................................................. 20
ID DISPLAY............................................................................................................................................................................................................................... 20
SET-UP 1...................................................................................................................................................................................... 21
SET DATE & TIME.................................................................................................................................................................................................................. 21
VIDEO SYSTEM...................................................................................................................................................................................................................... 21
VIDEO FORMAT..................................................................................................................................................................................................................... 21
ASPECT FOR VIDEO............................................................................................................................................................................................................ 21
ID NAME ................................................................................................................................................................................................................................... 21
RS485 BAUD RATE............................................................................................................................................................................................................... 21
RS485 TERMINATION......................................................................................................................................................................................................... 21
SET-UP 2...................................................................................................................................................................................... 22
PROTOCOL.............................................................................................................................................................................................................................. 22
SD CARD OVERWRITE....................................................................................................................................................................................................... 22
FORMAT SD CARD.............................................................................................................................................................................................................. 22
IP ADDRESS INFORMATION.......................................................................................................................................................................................... 22
IP ADDRESS SETTINGS RESET......................................................................................................................................................................................22
FIRMWARE............................................................................................................................................................................................................................... 22
COPY LOG DATA .................................................................................................................................................................................................................. 22
SET-UP 3...................................................................................................................................................................................... 23
RESET.......................................................................................................................................................................................................................................... 23
言語/LANG................................................................................................................................................................................................................................ 23

iv
Table of Contents
Troubleshooting 24
Defaults 25
SHOOTING MENU............................................................................................................................................................................................................... 25
SET-UP........................................................................................................................................................................................................................................ 25
Specications 26

1
Safety Precautions
For Your Safety
This section lists important precautions that must be followed to ensure safe and correct use of the product. Read them before
using the product and observe them during use.
The 4WARNING and 4CAUTION indications in this document indicate the following:
4WARNINGS Failure to observe warnings could result in death or serious injury.
4CAUTIONS Failure to observe cautions could result in injury or property damage.
4
4
WARNINGS
WARNINGS
• Take all steps necessary to prevent water entering the product. Failure to observe this precaution could result in re or electric
shock. Should water nd its way in, disconnect the power source immediately.
• Be sure the product is installed securely. Serious accidents could result should the product fall from a height.
• When working in high places, work with a partner or partners, use a safety line, and take all other precautions necessary to
ensure safety. Slipping, falling, or loss of balance could result in serious accidents.
• When installing the camera in high places, ensure that people below keep their distance. Falling objects could cause serious
accidents.
• Ensure that the surface on which the camera is installed is level. Failure to observe this precaution could cause the camera to
fall, potentially causing serious accidents.
4
4
CAUTIONS
CAUTIONS
• Keep the product out of direct sunlight.
• Do not turn the product on without rst conrming that the power supply is connected correctly.
• The product could cause injury if dropped during transport. Take all precautions necessary to ensure that the product is not
dropped.
• Ensure that the voltage of the power supply matches the product’s rated voltage. Incorrect voltages could damage the product
or result in re or electric shock.
• When connecting or disconnecting the power cable, hold the plug and not the cable. Damage to the cable could result in re
or electric shock.
• Should you detect any abnormalities such as smoke, unusual noises or smells, or the presence of foreign matter inside the
product, disconnect the power supply immediately and contact the original retailer.
• Do not disassemble or modify. Failure to observe this precaution could result in electric shock or product malfunction. Mal-
functions or damage resulting from customers disassembling or modifying the product are not covered under warranty.
• Do not aim the camera at the sun. Direct sunlight focused through the lens could damage the product’s internal parts.
• Install the camera base down. Installing the camera in other orientations could lead to warping that may impair product per-
formance.
General Precautions
General Precautions
• Use the product only as described in this manual.
• The camera and its accessories are precision devices. Under no circumstances should they be subjected to excessive force.
• Install the camera in a housing or other location where it will not be exposed to rain, wind, dust, or direct sunlight.
• Bringing the camera abruptly from a cold location to a warm and humid environment could cause the lens to fog. Take mea-
sures to allow the camera to adapt to the new environment before subjecting it to changes in temperature and humidity.
• Replace the cap if the camera will not be used for an extended period.
• The camera lens has a special anti-reective coating. As a result, the back of the lens may appear spotted, but this has no eect
on performance.

2
NOTICES
Verication
Model Number: SX801
Trade Mark: Fujilm
This device complies with Part 15 of the FCC Rules.
Operation is subject to the following two conditions:
(1) This device may not cause harmful interference, and (2) this device must accept any interference received, including interfer-
ence that may cause undesired operation.
Caution:
Caution:
This equipment has been tested and found to comply with the limits for a Class A digital device, pursuant to part 15 of the FCC
Rules.
These limits are designed to provide reasonable protection against harmful interference when the equipment is operated in a
commercial environment.
This equipment generates, uses, and can radiate radio frequency energy and, if not installed and used in accordance with the
instruction manual, may cause harmful interference to radio communications. Operation of this equipment in a residential area
is likely to cause harmful interference in which case the user will be required to correct the interference at his own expense.
FCC Warning:
FCC Warning:
To assure continued compliance, follow the attached installation instructions. This includes using the provided power cord and
shielded interface cables when connecting to computer or peripheral devices. Also, any unauthorized changes or modications
to this equipment could void the user’s authority to operate this device.
For Customers In Canada
For Customers In Canada
CAN ICES-3(A)/NMB-3(A)
WARNING: This equipment is compliant with Class A of CISPR32. In a residential environment this equipment may cause radio
interference.
This product complies with the following EU Directives:
• RoHS Directive 2011/65/EU
• EMC Directive 2014/30/EU
Compliance with these directives implies conformity to applicable harmonized European standards (European Norms) which are
listed on the EU Declaration of Conformity issued by FUJIFILM Corporation for this product or product family.
This compliance is indicated by the following conformity marking placed on the product:
This marking is valid for non-Telecom products and EU harmonized Telecom products (e.g.Bluetooth).
About the Icons
About the Icons
The symbols on the product represent the following:
AC
DC
Class II equipment (The construction of the product is double-insulated.)

3
NOTICES
Disposal of Electrical and Electronic Equipment in Private Households In the European Union, Norway,
Disposal of Electrical and Electronic Equipment in Private Households In the European Union, Norway,
Iceland and Liechtenstein:
Iceland and Liechtenstein:
This symbol on the product, or in the manual and in the warranty, and/or on its packaging indicates that this product
shall not be treated as household waste. Instead it should be taken to an applicable collection point for the recycling of
electrical and electronic equipment. By ensuring this product is disposed of correctly, you will help prevent potential
negative consequences to the environment and human health, which could otherwise be caused by inappropriate waste
handling of this product.

4
Precautions for Use
Operating Environment
• The camera can be used at temperatures of from −10 to +50°C (temperatures below freezing are only supported if the power
supply is not interrupted) and at humidities of from 10 to 80% (no condensation).
• Prolonged use at high temperatures or humidities could degrade components, shortening product life.
• Do not install the product where it will be exposed to solvents or other chemicals.
Installation
• Do not install cables in close proximity to cables for uorescent lights or other electrical devices. Failure to observe this precau-
tion could impair sound or image quality. Move the cables if signal quality is aected.
• Using the product in close proximity to powerful electromagnetic elds, such as those produced by television transmitter an-
tennas, electric motors, or transformers, could result in distorted or wavy pictures. Should this occur, use steel cable shielding.
• Plastic cable insulation may sometimes be damaged by crows or other birds. Protect cables using a cable conduit.
• Fix cables in place so that they are not subject to repeated vibration, friction, or tugging. Failure to observe this precaution
could cause the cable to break.
• Install the product base down.
Use
• Do not aim the lens directly at the sun or other bright light sources or reections. Failure to observe this precaution could result
in deterioration of the image sensor color lter, aecting picture color.
• Do not subject the product to strong physical shocks or vibration. Failure to observe this precaution could result in product
malfunction.
• Clean the product with a soft, dry cloth. Never use chemically-treated cloths or solvents such as benzine (petroleum ether),
thinner, or alcohol. Failure to observe this precaution could cause warping or discoloration.
Network Settings
• You will need to supply an IP address, subnet mask, and gateway IP address.
• The frame rate may drop if multiple streams are transmitted via unicast.
• When connected to multiple devices, the product will transmit data to all devices at the rate supported by the device with the
slowest receiving rate.

5
Introduction
Parts of the Camera
The Control Panel
The Control Panel
12345678
Item Name
APower switch
BPower lamp
CREC (record) button
DRESET button
EDIP switches (4 bits)
FSlot for micro SD memory cards
GPower connector
HAudio input/output connectors
ISerial number
JVideo output connector
Item Name
KHD-SDI output connector
LTELE button
MNEAR button
NFAR button
OOK/MENU button
PBACK button
QWIDE button
RLAN connector
SHDMI connector
T8-pin connector
Top
(handle screws attach here)
Base (mounting screws
attach here)
Lens Control panel Slot for
SD memory cards

6
Installation and Connection
Installation
Use the screw holes on the base to secure the camera to a mount or other surface.
4WARNING
Attach the product securely to a surface that can safely bear the combined weight of the camera and associated hard-
ware. Do not mount the camera in unstable locations or locations subject to frequent vibration or attach it to weak
materials such as drywall, ALC (autoclaved lightweight concrete), concrete blocks, or plywood. Injury could result
should the product fall from its mounting.
4CAUTIONS • Use ¼ʺ, UNC 20 thread screws with a thread engagement length of 6.5 to 10mm.
• Install the camera base down.
A handle can be attached using the screws on top of the camera.
4CAUTIONS
• Use M4 screws with a thread engagement length of at least 4mm and a protru-
sion of no more than 6mm.
• Do not use the screw holes on top of the camera for any other purpose.
Screw Hole Specifications
Screw Hole Specifications
The specications for the screw holes on the top and base of the camera are as follows:
Type Quantity Depth Tightening torque
Top M4 2 Pass through (threaded depth 4mm) 80–100N•cm
Base ¼ʺ, UNC 20 thread 15 10 mm 240–300N•cm
Handle
thickness 4mm
Max. 6mm

7
Installation and Connection
Connection Schematic
The schematic below illustrates how the camera can be installed for stand-alone use.
12345678
Control panel
SX801
HD-SDI connection
or
VIDEO connection
or
HDMI connection
Monitor
When the camera is connected to a monitor via an HD-SDI, VIDEO, or HDMI cable, you can view the live feed, control the camera,
and adjust camera settings via the control panel on the back of the camera.
Operating Mode Selection: DIP Switches
Use the DIP switches to select the operating mode.
Operating mode
DIP switch
ABCD
LAN ONVIF OFF ON OFF OFF
RS485 ON OFF OFF OFF
Stand-alone ON ON OFF OFF
12345678

8
Installation and Connection
Connecting to a Monitor
1 Connect the supplied plug to the power cable and plug the cable into the
camera power connector.
4CAUTION Use only DC 12V power.
bTIP Customers must supply their own power cable.
2 Connect the camera to the monitor using the appropriate cable.
4CAUTION
The camera cannot be connected via HD-SDI while connect-
ed via HDMI. Similarly, the camera cannot be connected via
HDMI while connected via HD-SDI.
12345678
HD-SDI connection
VIDEO connection
HDMI connection
3 Select stand-alone mode by setting DIP switches Aand Bto“ON”and DIP
switches Cand Dto “OFF”.
12345678

9
Camera Controls
Use the control panel on the back of the camera for live feed or camera control or adjusting camera settings. To display the
menus, press and hold the OK/MENU button for 3 seconds.
12345678
The following buttons are used to navigate the menus and control the camera:
Button
Function
Menu navigation Camera control
NEAR button Move the cursor left Focus closer to the camera
FAR button Move the cursor right Focus further away from the camera
WIDE button Move the cursor down Zoom out
TELE button Move the cursor up Zoom in
OK/MENU button Select the highlighted item/
press and hold for 3 seconds to display the menus
—
BACK button Return to the previous display View or hide the focus area and zoom frames
REC button Record footage to the SD memory card
RESET button
Restore factory default settings
Note: Pressing and holding the button for 3 seconds displays a confirmation dialog. Follow the on-screen instructions
to restore factory default settings.
FAR+ NEAR buttons — Press the two buttons at the same time to focus using one-push AF
bTIP Press and hold the RESET button for 3 seconds and then select OK to restore default settings when prompted. This restores all
settings except the IP address to their default values.
Control panel

10
Basic Setup
The rst time you turn the camera on, you will be prompted to choose a language and set the camera clock.
Choosing a Language and Setting the Clock
1 Turn the camera on. A splash screen will be displayed, followed by a lan-
guage-selection dialog. 12345678
2 Using the control panel TELE (e) and WIDE (f) buttons to move the cursor
up and down, highlight the desired language and then press OK.
START MENU
言語/LANG .
日本語
FRANCAIS
ENGLISH
SET NO
3 You will next be prompted to choose from 24- and 12-hour clocks. Press
TELE (e) and WIDE (f) to choose an option and press FAR (h) to proceed. DATE/TIME NOT SET
NEXT NO
24h
12h
M-D-Y
4 Press TELE (e) and WIDE (f) to choose a date format and press FAR (h)
to proceed.
Y-M-D
24h
D-M-Y
M-D-Y
Y/M/D
M/D/Y
DATE/TIME NOT SET
NEXT
NO

11
Basic Setup
5 Set the clock, using NEAR (g) and FAR (h) to highlight options and TELE
(e) and WIDE (f) to edit the highlighted option. Press OK when the pro-
cess is complete.

DATE/TIME NOT SET
3
2
31
30
1 1-2020 20:00
SET NO
bTIPS
• You can skip the current step by pressing the BACK button in the control panel. You will be prompted to complete
any steps you skipped the next time you turn the camera on.
• You can also choose a language and set the clock from the setup menu.
Memory Card Warning
If no memory card is inserted or if a memory card is inserted with the
write-protect switch in the“lock”position, a warning will be displayed. Check
that a memory card is correctly inserted in the memory card slot.
NO MEMORY CARD
INSERT A NEW CARD
Warning displayed when no memory card is
inserted.

12
Camera Menus
Using the Menus
Use the menus to adjust camera settings. Press and hold the control panel OK button to display the menus and use the TELE (e),
WIDE (f), NEAR (g), and FAR (h) buttons to move the cursor up, down, left, and right, the OK button to select highlighted items,
and the BACK button to exit to the previous menu.
1 Hold the OK button for 3 seconds to display the menus.
SHOOTING MENU
EXIT
DAY/NIGHT
SHUTTER SPEED
GAIN
IR WAVELENGTH
FOCUS
IRIS
AUTO
AGC
AUTO
VISIBLE LIGHT
EXTERNAL TRIGGER Off
AUTO
Q-AF
2 Press NEAR (g) to highlight the tab for the current menu.
SHOOTING MENU
EXIT
DAY/NIGHT
SHUTTER SPEED
GAIN
IR WAVELENGTH
FOCUS
IRIS
AUTO
AGC
AUTO
VISIBLE LIGHT
EXTERNAL TRIGGER Off
AUTO
Q-AF
3 Press TELE (e) and WIDE (e) to highlight the tab for the desired menu.
SHOOTING MENU
EXIT
FOG REDUCTION
BACKLIGHT CORRECTION
HEAT HAZE REDUCTION
DIGITAL ZOOM
OPTICAL FILTER(VLC)
AFWDR
OFF
OFF
OFF
OFF
NOISE REDUCTION 2
OFF
OFF
4 Press FAR (h) to place the cursor in the selected menu.
SHOOTING MENU
EXIT
FOG REDUCTION
BACKLIGHT CORRECTION
HEAT HAZE REDUCTION
DIGITAL ZOOM
OPTICAL FILTER(VLC)
AFWDR
OFF
OFF
OFF
OFF
NOISE REDUCTION 2
OFF
OFF

13
Camera Menus
5 Press TELE (e) and WIDE (f) to highlight the desired item.
SHOOTING MENU
EXIT
FOG REDUCTION
BACKLIGHT CORRECTION
HEAT HAZE REDUCTION
DIGITAL ZOOM
OPTICAL FILTER(VLC)
WDR
OFF
OFF
OFF
OFF
NOISE REDUCTION 2
OFF
OFF
6 Press FAR (h) to view options for the highlighted item.
NOISE REDUCTION
1
3
2
7 Choose the desired option and press OK.

14
Camera Menus
SHOOTING MENU 1
SHOOTING MENU
EXIT
DAY/NIGHT
SHUTTER SPEED
GAIN
IR WAVELENGTH
FOCUS
IRIS
AUTO
AGC
AUTO
VISIBLE LIGHT
EXTERNAL TRIGGER Off
AUTO
Q-AF
FOCUS
FOCUS
Choose how the camera focuses.
Option Description
CONTINUOUS AF
The camera adjusts focus continuously in response to changes in the distance to the subject. Choose from
the following focus-area selection and subject-tracking options.
Sub-menu Description
FOCUS AREA • CENTER: The camera focuses on the subject at the center of the frame.
• AREA: The frame is divided into a three-by-three grid for focus-area selection.
AF SENSITIVITY
Choose how long the focus system will continue to track the current subject after a
new subject enters the frame at a different distance from the camera. Choose from
three levels for AF SENSITIVITY: 3, 2, and 1. The higher the value, the longer the
camera will wait before switching subjects.
QUICK AF The camera refocuses on the subject at the center of the frame each time zoom is adjusted. Focus can be
adjusted manually when zoom is not in use.
MANUAL Focus manually.
IRIS
IRIS
Choose the aperture value (iris). See “Specications”(page 26) for supported values.
SHUTTER SPEED
SHUTTER SPEED
Choose the shutter speed.
Option Description
AUTO The camera adjusts shutter speed automatically. You can choose the minimum shutter speed.
MANUAL Choose the shutter speed manually.

15
Camera Menus
GAIN
GAIN
Adjust image brightness.
Option Description
MANUAL Choose a value for gain.
AGC The camera adjusts gain automatically to brighten the image when lighting is poor.
HYPER-AGC Choose for automatic gain control adapted to low light conditions.
DAY/NIGHT
DAY/NIGHT
In day/night mode, the camera records in color when the subject is brightly lit and in black-and-white when the subject is poorly
lit. This option is available when O is selected for both EXTERNAL TRIGGER and OPTICAL FILTER (VLC).
Option Description
AUTO
The camera selects day or night mode automatically according to lighting conditions. You can choose the
brightness level that triggers the switch:
• DARK: The switch is triggered when lighting is comparatively dark.
• MID: The switch is triggered at light levels between DARK and BRIGHT.
• BRIGHT: The switch is triggered when lighting is comparatively bright.
DAY The camera operates in day (color) mode at all times.
NIGHT The camera operates in night (black-and-white) mode at all times.
bTIP The SHOOTING MENU1> DAY/NIGHT, EXTERNAL TRIGGER, and IR WAVELENGTH and the SHOOTING MENU3> OPTICAL
FILTER (VLC) preferences are linked. For more information, see“Lighting Triggers”(page 16).
EXTERNAL TRIGGER
EXTERNAL TRIGGER
Choose whether day/night selection is performed in response to an external trigger.
Option Description
VLCFilter Applies a VLC (Visible Light Cut) filter to the external trigger. SHOOTING MENU 1> DAY/NIGHT and
SHOOTING MENU3> OPTICAL FILTER (VLC) are disabled.
Clear Replaces the filter with clear glass. SHOOTING MENU1> DAY/NIGHT and SHOOTING MENU3> OPTICAL
FILTER (VLC) are disabled.
Off The camera does not respond to the external trigger.
bTIP The SHOOTING MENU1> DAY/NIGHT, EXTERNAL TRIGGER, and IR WAVELENGTH and the SHOOTING MENU3> OPTICAL
FILTER (VLC) preferences are linked. For more information, see“Lighting Triggers”(page 16).

16
Camera Menus
IR WAVELENGTH
IR WAVELENGTH
Match the IR wavelength to the infrared light source used. See “Specications” (page 26) for supported values.
bTIP The SHOOTING MENU1> DAY/NIGHT, EXTERNAL TRIGGER, and IR WAVELENGTH and the SHOOTING MENU3> OPTICAL
FILTER (VLC) preferences are linked. For more information, see“Lighting Triggers”below.
Lighting Triggers
Day/night selection can be configured in any of the following three ways:
Configuration Description
Configured using
Menu item Option
A
Auto Day/night selection is performed automatically in response to lighting
conditions. SHOOTING MENU1>
DAY/NIGHT
AUTO
B
Manual Day/night selection is performed manually. DAY or NIGHT
C
External
trigger
Day/night selection is performed in response to input from an external
trigger.
SHOOTING MENU3>
EXTERNAL TRIGGER
VLCFilter*, Clear*,
or Off
* The option selected for OPTICAL FILTER (VLC) does not apply if a signal is received from the external trigger when VLCFilter or Clear
is selected for EXTERNAL TRIGGER. If no signal is received or if Off is selected, the optical filter will function as shown in the following
table.
The following table shows relation between the option selected for OPTICAL FILTER (VLC) and the filter type, image color, and wave-
length when day/night selection is enabled:
Option
SHOOTING MENU 3>
OPTICAL FILTER (VLC) Filter Image color
SHOOTING MENU 1> IR WAVELENGTH
Status Supported wavelengths
DAY OFF IRCF Color Disabled Visible light only
ON VLCF Black and
white
808nm only
NIGHT OFF CLEAR Enabled 950nm, 940nm, 850nm,
808nm, visible light
ON VLCF