Lahoux Optics Horus User manual

Lahoux Horus
Multifunctional Thermal Imaging Camera
User manual

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Contents
1 Overview .............................................................................................................. 4
1.1 Features ...........................................................................................................4
1.2 Scope of delivery .............................................................................................4
2 Operation instructions ........................................................................................ 5
2.1 First time use ...................................................................................................5
2.2 (Re)placing battery ..........................................................................................5
2.3 Setting focus....................................................................................................6
2.4 Button operation ..............................................................................................6
2.5 Switching on/off ...............................................................................................7
2.6 Performing a non-uniformity correction (NUC) ............................................... 7
2.7 Changing the colour palette............................................................................ 8
2.8 Using digital zoom........................................................................................... 9
2.9 Entering and leaving the menu .......................................................................9
3 Mounting instructions ....................................................................................... 10
3.1 Using the mounting thread............................................................................10
3.2 Mounting the Lahoux HORUS with an AD-545-X adapter.............................10
3.3 Adjusting the AD-545-X adapter....................................................................11
4 Menu .................................................................................................................. 12
4.1 Lahoux HORUS button operation within the menu.......................................12
4.2 Menu structure tree........................................................................................12
4.3 Basic menu structure..................................................................................... 13
4.4 Advanced menu structure .............................................................................13
4.5 Battery saving menu...................................................................................... 14
4.6 Boresight adjustment menu ..........................................................................14
4.7 Information menu...........................................................................................15
5 Storage and maintenance................................................................................. 16
5.1 General storage guidelines ...........................................................................16
5.2 Cleaning the Lahoux Horus...........................................................................16
5.3 Cleaning the optics........................................................................................16
6 Troubleshooting guide ...................................................................................... 17
7 Specifications.................................................................................................... 19
7.1 Typical range performance............................................................................ 19
7.2 Technical specifications.................................................................................19
7.3 Mechanical dimensions.................................................................................20
8 Customer Support............................................................................................. 21

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Notes
The user manual details the use of the Lahoux HORUS and the pre-
cautions for its use. For the protection of the operators safety, as well
as the reasonable and effective maintenance and use of the Lahoux
HORUS, and also to guarantee the normal service life of the Lahoux
HORUS, the company requires the user to read and strictly abide by
the requirements of the following operating specifications before using
the Lahoux HORUS.
The use and maintenance of the Lahoux HORUS should be subject
to the supplied user manual only. Other materials are for reference
purposes only..
If you experience any problems during the use of the Lahoux HORUS,
first check chapter 6 (Troubleshooting) and then contact your point
of sale or Lahoux Optics technical support as soon as possible. See
chapter 8 (Customer support).

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Precautions
• Protect the Lahoux HORUS from direct sunlight and extreme heat. Do not leave the
Lahoux HORUS unprotected in a car;
• The Lahoux HORUS combines sophisticated optical instruments and electrosta-
tic-sensitive electronic equipment, Prevent unnecessary mechanical loads that can
cause deformation or damage.
• Do not disassemble the Lahoux HORUS by yourself, in the event of a malfunction,
which cannot be solved with the help of the operating instructions, please contact
the Lahoux Optics service department. Unauthorised disassembly will lead to an
irrevocably expiration of the warranty.
• When the Lahoux HORUS is not in use for a longer period or during transportation,
please remove the battery. Place the Lahoux HORUS in the supplied pouch or
original box;
• Please replace the battery in time when the battery power is too low, to avoid
• over-discharge damage to the battery;
• Using the Lahoux HORUS in an environment that is beyond the limitations mentio-
ned in this user manual may cause damage to the Lahoux HORUS.
Attention
• Before the first use please check if the scope of delivery is complete. Should parts
be missing, please report this to your point of purchase immediately.
• Do not dispose the Lahoux HORUS in regular waste. The device can be returned
for recycling to the point of purchase or a local recycling point.

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1 Overview
The Lahoux HORUS is a is lightweight and compact thermal imaging camera. It is
fully designed, manufactured and assembled by Lahoux Optics in the Netherlands.
The working principle of the Lahoux HORUS is as follows: infrared radiation is
focused on the sensor array by the objective lens and electronically converted into a
digital image. This image is processed and displayed on the OLED screen.
1.1 Features
• Next generation 12µm VOx thermal sensor. The best performance in the smallest
size.
• Intuitive and simple operation. No unnecessary distraction from your hunting
experience.
• High magnification optics. Optimized for use with primary optics, magnification
over 10x is possible.
• Ergonomically, rear mounted focus knob. Stay conveniently in position without
disturbing your surroundings.
• Fast zoom. The three times zoom, only active while pressing the button, keeps
your focus on the zoomed area.
• Ultra-long battery lifetime. No unexpected shut down because of limited battery
capacity.
1.2 Scope of delivery
• Lahoux HORUS thermal front attachment
• 18650 3.7V 3400mAh rechargeable Li-ion battery
• Battery charger
• Wall wart USB adapter 110-240V to 5V at 1A
• USB charging cable
• Pouch
• User manual
• Lens tissue

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2 Operation instructions
2.1 First time use
Make sure the battery is charged. The battery can be placed both ways. The polarity
is automatically detected and corrected.
1. Place the battery into the battery compartment.
2. Screw the battery cap on the battery compartment thread until firm.
3. Hold the Power/NUC button until the Lahoux HORUS switches on.
4. Remove the lens cap. Adjust the rear mounted focus knob if objects appear blurred
or unclear.
2.2 (Re)placing battery
To replace the battery, unscrew the battery cap. Remove the old battery. Make sure
the new battery is charged, and place it into the battery compartment. Screw the
battery cap on the battery compartment thread until firm.
The Lahoux HORUS uses only one type of battery.
• A protected 18650 3.7V Li-ion battery, as supplied with the Lahoux HORUS.
• You can use another battery with more or less capacity. The run time will change.
Note: A so called “unprotected 18650” battery will have a slightly reduced length,
and may therefore cause interruptions in operation when the Lahoux HORUS is
subjected to vibrations or shock. The length of the battery should be in the 68.5 –
70mm range.
Note: The Lahoux HORUS has an internal over-voltage protection to prevent dam-
age from incorrect battery types or faulty USB adapters. The over-voltage protection
activates automatically if the voltages exceeds 5.5 volt. For this reason, the Lahoux
HORUS will not operate when two CR123A batteries are being used.

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2.3 Setting focus
Should the image appears blurry or unsharp, use the focus knob to set the focus
correctly. The focus range spans at least 10 meters to infinity.
For typical use it is recommended to set the focus at about 100 meters, which will
yield an acceptable focus from 30 meter to infinity without refocussing.
Caution
The focus knob has a mechanical stop at the end of travel. Do not force the
focus knob beyond this mechanical stop, as this may damage the focussing
mechanism!
2.4 Button operation
Power/NUC Color Zoom
Short Press Perform NUC Change color palette -
Hold Shut down Enter/leave menu Digital zoom 3x
Light sensor Indicator
Focus
Colour ZoomPower/NUC

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2.5 Switching on/off
The Lahoux HORUS can be switched on or off by holding the Power/NUC button for
1.5 seconds. When using a menu, this has to be exited before the Lahoux HORUS
can be switched off.
Note: When switching the Lahoux HORUS on with the shutter set to ‘external’, leave
the lens cap on the objective lens until start-up has finished.
2.6 Performing a non-uniformity correction (NUC)
During start-up and after some time of use, there will be a temperature difference
over the sensor array. This difference will lead to a non-uniformity in the image. This is
often perceived as a dark or light circle in the center image, or vignetting around the
corners. This is normal thermal system behaviour, and can be corrected by perform-
ing a non-uniformity correction (NUC). The Lahoux HORUS offers three NUC options
in the basic menu.
• Auto
When set to Auto, the Lahoux HORUS will calculate when a NUC is required on
basis of temperature difference or time interval. No user input is required. This
mode will at seemingly random moments briefly freeze the image each time a NUC
is performed. Therefore this mode is only recommended when the Lahoux HORUS
is used for observation.
• Manual
The Manual mode is preferred if an uninterrupted video stream is required. The
NUC has to be manually triggered by pressing the Power/NUC button. This mode
is best suited for hunting applications.
• External
The External NUC offers the best results when the Lahoux HORUS is subjected to
strong winds or adverse weather conditions. This mode corrects both the sensor
array non-uniformity as well as temperature gradients in the objective lens. The
manual NUC mode requires covering of the objective lens.
An external NUC is performed by the following procedure.
1. Place the lens cap on the objective lens.
2. Assure the Lahoux HORUS is not currently displaying a menu. If necessary, leave
any menu by holding the Color button.
3. Press the Power/NUC button. This initiates the non-uniformity correction.
4. Remove the lens cap and resume normal operation.
Note: If both hands are free, the objective lens can alternatively also be covered com-
pletely with the full palm of one hand while performing an external NUC.

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2.7 Changing the colour palette
The Lahoux HORUS is equipped with various colour palettes to enhance the image
for any given circumstance. Briefly press the Colour button to cycle through the vari-
ous colour palettes. The following colour palettes are available.
Palette Description
White hot Standard black/white palette for thermal
cameras. Good level of detail in a grey
scale and good detection capabilities for
hot sources.
Black hot Inversed black/white palette for a more
natural appearance of scene. This gives
an enhanced image during very cold or
freezing weather circumstances and a
clearly visible outline of an object.
Hotspot Standard black/white palette with hottest
parts coloured in a red to yellow gradient.
This palette offers enhanced detection of
hot sources.
Colour Coloured palette with enhanced contrast
between hottest and coldest parts of the
scene.
Contrast Colored palette with very sharp temperature
contrast. This palette offers an enhanced
image in very adverse weather, where
normally no thermal image could be
shown.

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2.8 Using digital zoom
The Lahoux HORUS features 3x digital zoom. Hold the zoom button down to activate
the digital zoom. Upon releasing the button, the zoom level will return to 1x.
2.9 Entering and leaving the menu
The menu can be activated by holding the Colour button until the menu appears in
the image. The menu can be left at any time by holding the Colour button for 1.5
seconds.
By using the on/off button you can scroll through the menu items. The Colour and
Zoom button can be used to select an item.
The menu is described in more detail in the “Menu” chapter.

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3 Mounting instructions
The Lahoux HORUS can be mounted to a primary or binocular optic by means of the
thread adapter ring at the rear. Alternatively, an AD-545-X clamping adapter can be
used (sold separately).
3.1 Using the mounting thread
The Lahoux HORUS can be mounted directly to a primary optic if the primary optic
has an M52x0.75 lens thread.
1. Assure the primary optic is suitable for mounting a thermal attachment before conti-
nuing. Consult your reseller or the primary optics manufacturer if unsure.
2. Screw the thread adapter ring of the Lahoux HORUS at least 4mm into the lens
thread of the primary optic. It is advisable to screw the Lahoux HORUS into the
thread as far as possible.
3. Rotate the Lahoux HORUS for a proper orientation with respect to the primary
optic.
4. Use the knurled stop ring on the thread adapter ring to fix the Lahoux HORUS in
position, Hand-tight only. Use the supplied key only to loosen the stop ring.
3.2 Mounting the Lahoux HORUS with an AD-545-X
adapter
The AD-545-X adapters comes in various size options, in order to suit many differ-
ent primary magnifying optics. Please specify the intended primary optic brand and
model when ordering. If the brand and model are unknown or uncommon, specify the
outer diameter of the primary optic objective lens.
The AD-545-X part number has a -X suffix, where -X stands for the primary objective
lens diameter it was designed for. For example, a spotting scope with a 62mm outer
diameter would require an AD-545-62 adapter.
AD-545-X
Stub screw
Locking ring
Tightness adjustment
Thread adapter ring

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Mounting the Lahoux HORUS using an AD-545-X adapter is done as follows.
1. Assure the primary optic is suitable for mounting a thermal attachment before conti-
nuing. Consult with the primary optics manufacturer or your reseller if unsure.
2. The thread adapter ring is glued to the rear of the Lahoux HORUS and can’t be
removed.
3. Screw the AD-545-X adapter at least 4mm onto the thread adapter ring. In principle
screw the adapter in as far as possible.
Then rotate the clamping adapter to a position where the rocking lever is in a
convenient position.
4. Use the knurled stop ring on the thread adapter ring, hand-tight only, to fix the AD-
545-X in position.
Note: Use the supplied key only to loosen the stop ring as thread is easily fixed and
difficult to unscrew.
5. Place the Lahoux HORUS onto the primary optic, and check if it fits tightly when
the AD-545-X rocking lever is moved forward. Adjust the tightness of the AD-545-X
adapter if necessary.
3.3 Adjusting the AD-545-X adapter
The AD-545-X adapter allows for small adjustments in case it is too tight or too loose
around the primary optic.
1. Loosen the stub screw at the rear of the adapter using the provided hex key.
2. Tighten or loosen the large cylinder head screw to adjust the tightness of the adap-
ter using the larger one of the supplied hex keys.
3. Tighten the stub screw at the rear once the adjustment is done.

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4 Menu
The menu can be activated by holding the Color button until the menu appears in the
image. The menu can be left at any time, by holding the Color button for 1.5 seconds.
While the menu is active, the operation of the buttons is changed.
4.1 Lahoux HORUS button operation within the menu
Power/NUC Color Zoom
Short Press Cycle menu items Increase/Select item Decrease/Select item
Hold Leave menu
4.2 Menu structure tree
BASIC
Brightness
Enhance
Calibration
Advanced...
ADVANCED
Battery saving...
Boresight...
Info...
Language...
BATTERY
SAVING
Battery saving
Delay
BORESIGHT
Lock
Profile (A-D)
Shift H
Shift V
INFO
Device info...
Statistics...
Factory reset
(press 5x zm)
Factory setup...
LANGUAGE
English
Deutsch
Nederlands
DEVICE INFO
Device name
Serial number
Firmware version
Sensor S/N
STATISTICS
3D-Sensor
Ambient light level
Battery voltage
Operation hours
FACTORY
SETUP
Reserved for
manufacturer
only

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4.3 Basic menu structure
Parameter Value Info
Brightness 0 – 10 Sets the display brightness.
Enhance Off, 1 – 3 Sets the enhancement level for use in
adverse weather. Higher contrast values
may increase fixed pattern noise resulting
in a grainier image.
Calibration Auto, manual,
external
Selects the NUC behaviour.
• Auto: Automatic shutter based on
temperature difference or time interval.
This mode does not require user input,
however the user can trigger a NUC by
pressing the Power/NUC button. This
mode is recommended for observation.
• Manual: Requires the user to press the
Power/NUC button each time a shutter
is required. This mode guarantees an
uninterrupted video stream, and is best
suited for hunting applications.
• External: Requires the user to cover
the objective lens and press the Power/
NUC button each time a shutter is
required. This mode is best suited for
use during rain, strong winds or adverse
weather conditions. The sensormatrix
and the objective lens will be corrected
simultaneously.
Advanced... Switches to the advanced menu.
4.4 Advanced menu structure
Parameter Value Info
Battery saving... Enters the battery saving menu.
Boresight... Enters the boresight adjustment menu.
Info... Enters the information menu.
Language Enters the language setting menu

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4.5 Battery saving menu
Parameter Value Info
Battery saving On, off Enables or disables automatic shutdown
based on position or movement.
Delay 1 – 20 minutes Sets the delay between inactivity detection
and shutdown. Higher values allow the
device to continue operating longer while
inactive. Lower values will increase battery
lifetime.
4.6 Boresight adjustment menu
Parameter Value Info
Lock On, Off Locks the current boresight profile settings.
No changes can be made to profile
selection or boresight setting as long as the
lock function is enabled.
Profile A – D The Lahoux HORUS has memory for four
separate boresight adjustment settings.
This allows easy switching between
different primary optics without the need for
re-adjusting boresight after each change.
This can be used on a binocular to adjust
two Horus devices for perfect binocular
vision.
The Shift H and Shift V setting for each
profile are automatically set once the profile
is selected. Any adjustment is automatically
saved to the active profile.
Shift H -30cm – +30cm Adjusts the horizontal boresight adjustment
for the selected profile. Negative values
adjust to the left, positive values adjust
to the right. Adjustments are made in
0.15mrad steps, equal to 1.5cm at 100
meters.
Shift V -30cm – +30cm Adjusts the vertical boresight adjustment
for the selected profile. Negative values
adjust downward, positive values adjust
upward. Adjustments are made in 0.15mrad
steps, equal to 1.5cm at 100 meters.

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4.7 Information menu
Parameter Value Info
Device info... Shows the following information.
• “Lahoux HORUS”
• Serial number
• Firmware version
• Sensor S/N
Statistics... Shows the following information.
• 3D-sensor
• Ambient light level
• Battery voltage
• Operation hours.
Note: The operation hours counter may
not start at zero due to testing procedures
performed during assembly and quality
assurance.
Factory reset Press 5 times the
Zoom button, not
the Colour button
Resets all user set values to factory default.
It is strongly recommended to make a
note of all settings done to the device prior
to performing a factory reset. Note that
boresight adjustment settings will be lost
as well!
Factory setup... Factory menu with entry code. Allows
authorized service personnel to make
changes to the Lahoux HORUS for service
purposes.

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5 Storage and maintenance
5.1 General storage guidelines
• Remove the battery when the device is not being used for a prolonged period of
time.
• Store the Lahoux HORUS in a cool, clean and dry environment when not in use.
Preferably store the Lahoux HORUS in its original shipping box or the provided
pouch.
• Always put the objective lens cap on the Lahoux HORUS when it is not being used.
• Protect the device from direct sunlight and extreme heat. Do not leave the device in
the sun or on the dashboard of a car.
5.2 Cleaning the Lahoux Horus
If desired, the Lahoux HORUS housing can be wiped clean with a damp cloth and
optionally a mild detergent. Do not rub the cloth forcefully against the housing, as this
may damage the coating. Do not immerse the device in fluid, or use strong alkaline
or acids solutions for cleaning. Do not use solvents such as acetone, paint thinner or
gasoline for cleaning.
5.3 Cleaning the optics
The optics should be kept clean of fingerprints, dust and grease at all times. The op-
tics can be cleaned with standard optics cleaning materials, such as the Lahoux lens
tissue, a microfiber cloth or compressed air. Remove sand and abrasive particles with
compressed air before touching the lens with any cleaning materials.

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6 Troubleshooting guide
Consult the troubleshooting guide first if you experience any problems with the
Lahoux HORUS. If the problem remains, please contact your dealer for any question
or service. Alternatively contact Lahoux Optics Services at the address given in the
contact details section of this manual.
Problem Solution
The device does not
produce an image.
• The device is not switched on. Switch the device on by
holding the Power/NUC button until an image appears.
• The battery is drained. Replace the battery.
• The lens cap is still on the objective lens. Remove the
lens cap.
• The battery voltage or USB voltage is higher than the
over-voltage limit. Use the correct type of battery.
The image does not
look good.
• Focus is set incorrectly. Use the focus knob to set the
focus correctly.
• The focus on your primary optic is not set to 100 meters.
Adjust primary optic focus until the image is sharp.
• The brightness is set too high or low. Adjust the bright-
ness in the Basic menu.
• The selected colour palette is not to your liking. Press the
Color button to cycle through the available color palettes.
• Contrast is enabled or set too high. Disable the Contrast
function in the basic menu, or decrease its value.
The image looks
grainy or has fixed
pattern noise
• Too much time has passed since the last NUC. Perform
a manual or, if this is not enough, an external NUC by
covering the objective lens, and subsequently pressing
the Power/NUC button.
• Contrast is enabled or set too high. Disable the Contrast
function in the basic menu, or decrease its value.
The image is unsharp
or blurry
• Focus is set incorrectly. Use the focus knob to set the
focus correctly.
• The object viewed is too close to be focussed correctly.
Increase distance to the object being viewed.
• The focus on your primary optic is not set to 100 meters.
Adjust primary optic focus until image is sharp.
The device switches
off unexpectedly
• The ‘auto shutdown’ is enabled in the Battery saving
menu. Check if the ‘auto shutdown’ is enabled and
disable if desired.
• The battery has been drained. Replace the battery.
• An 18650 battery of insufficient length is being used.
Replace with an 18650 battery with a length of 68.5 –
70mm.
• The battery voltage is higher than the over-voltage limit.
Use the correct type of battery.

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The boresight error is
too large
• The incorrect profile has been selected for the chosen
primary optic. Select appropriate profile.
• The boresight adjustment has not been set correctly.
Select the appropriate profile and adjust the boresight.
Start at (X=0,Y=0).
• The Lahoux HORUS has less than 5mm clearance be-
tween itself and its surroundings. Increase clearance.
• The Lahoux HORUS has not been mounted correctly.
Correct mounting.
• The primary optic does not support the Lahoux HORUS
weight. This primary optic is not suitable for mounting a
front attachment.
The image is too
bright or too dark
• Brightness has not been set correctly. Adjust the bright-
ness in the Basic menu.
The red indicator
light is continuously
lit
• An unsuitable battery is placed in the device. Replace
with the specified type.
• The device has detected an internal error. Please contact
Lahoux Optics to have the issue resolved if the device
stays inoperable.