Leica Microsystems HM500 User manual

Leica HM500
User Manual
10 715 697 – Version B
Living up to Life

Chapter overview
Leica HM500/Ref. 10 715 697/Version B
Introduction 3
Controls 5
Accessories 9
Preparation Before Surgery 11
Operation 27
Safety Notes 29
Care and Maintenance 38
What To o If... 46
Technical ata 50
Thank you for deciding in favor of a Leica microscope system.
In developing our systems, we have placed great emphasis on
simple, self-explanatory operation. All the same, please take
the time to read this user manual to learn what your head-
mounted microscope can offer and how to use it to best
advantage.
For valuable information about products and services from
Leica Microsystems and the address of the nearest dealership,
see our home page:
www.leica-microsystems.com
Thank you for choosing our products. We hope that you will
enjoy the quality and performance of your new Leica head-
mounted microscope.
Leica Microsystems (Schweiz) AG
Surgical ivision

Contents
Leica HM500/Ref. 10 715 697/Version B 1
Page
Introduction
User manual 2
Product description 2
Product identification 2
Symbols in this user manual 3
Symbols used on the instrument 3
Overview 4
Controls
Leica HM500 microscope 5
Leica HM500 footswitch 6
Leica HM500 ental footswitch 7
Leica HM500 ental databox 7
Leica MLS500 light source 8
Leica HM500 trolley (optional) 8
Accessories
Accessories 9
Preparation Before Surgery
Checklist before the operation 11
Connecting the Leica HM500 12
Connecting the Leica HM500 ental 13
Leica MLS500 light source 21
Leica HM500 footswitch/
Leica HM500 ental footswitch and ental databox 23
Transportation 24
Unpacking/packing the Leica HM500 headset 25
Unpacking/packing the Leica HM500 footswitch or
databox/Leica HM500 ental footswitch 26
Operation
Adjusting the microscope 27
Safety Notes
Intended use 29
irections for the person responsible
for the instrument 29
Responsibility 30
Legal regulations 30
Information for the user 30
Notes on the Leica HM500 trolley 30
angers during use 31
Manufacturer’s declaration of electromagnetic
compatibility (EMC) 33
Signage 37
Care and aintenance
Care instructions 38
Cleaning 38
Maintenance and repair 39
isposal 40
Adjusting the adjustment knobs on the headset 41
Changing the lamp 41
Changing filters 43
Changing the fuse of the Leica MLS500 light source 44
Changing the battery of the ental footswitch/databox 44
Page
What To Do If...
Leica HM500 troubleshooting 46
Footswitch 47
Headset 47
Camera 47
Leica MLS500 light source 48
Technical Data
Electrical data 50
Leica HM500 headmounted microscope 50
Leica HM500 footswitch 50
Leica MLS500 light source 50
Ambient conditions 51
Standards 51
Limitations on use 51
Leica HM500 trolley with isolating
transformer (optional) 51
Leica HM500 field of view/magnification 52

Introduction
Leica HM500/Ref. 10 715 697/Version B
User manual
In addition to instructions for use, this user man-
ual also provides important safety notes (see the
chapter entitled, "Safety notes").
Before commissioning the product, carefully read
through the user manual.
Product identification
The model and serial number of your product are shown on the
identification label. Enter this data in your User Manual and
always refer to it when you contact us or the service workshop
regarding any questions you may have.
Type: Serial No.:
Product description
The Leica HM500 is a global first in the field of optical aids to
vision and has the following features:
•Variable working distance (specimen – eye) which can be
varied between 300 and 700 mm with the aid of the autofocus
feature—in addition, the focus can be controlled manually by
the footswitch.
• Using the speed focus (holding down the manual focus
switch activates autofocus), you can focus quickly and pre-
cisely on the desired specimen, even in manual mode.
• For the standard eyepiece (20x), the magnification range is
between 2.9–7x. Within this range, each factor can be
selected using a foot switch.
Optional: Interchangeable eyepieces, eyepieces I (14x):
2.0x–4.8x or eyepiece II (26x): 3.75x–9x easily interchangeable
by the user.
• Automatic parallax compensation for focusing.
• Individual adaptation to eye characteristics (distance
between pupils) and correction of defective vision
(near/farsightedness, astigmatism) by means of an eyepiece
for eyeglass wearers.
• Improved depth perception and 3 effect due to an enlarged
stereoscopic parallax.
• The Leica HM500 does not need to be connected to the
power supply system to operate but runs on a battery
(footswitch) which gives a warning when the charge falls
below 10 %.
• Ergonomic headset with infinitely variable height adjustment
and adjustment of main movement axes.
• The ergonomic design of the Leica HM500 also enables the
user to view specimens to the side and below and above the
Leica HM500.
• To afford an unrestricted view downwards, the Leica HM500
can also be swung upwards without the headset needing to
be taken off.
• Integrated coaxial light for shadow-free illumination of the
operating field.
• Integrated autofocus camera in color for parallax-free pre-
sentation of the image information on a monitor, for example.
2

Introduction
Leica HM500/Ref. 10 715 697/Version B 3
Symbols used on t e instrument:
Instrument switched off Instrument switched on
Rotary knob for filter settings A, B and C ( : filter
swung out)
isplay for running-time meter and messages
Mechanical brightness control (diaphragm)
Connection for potential equalization
Reset the running-time meter
Fuse symbol: Use fuses of the specified type only!
CE mark of conformity: Confirms conformity with
EU irective 93/42/EEC for medical products.
Optional: cTÜVus mark: Confirms conformity with
UL2601-1, if attached to the identification label.
Lamps, suitable for direct fastening to normally flam-
mable fastening surfaces.
This symbol indicates the model year.
This symbol on the identification label indicates that
these light sources are designed for Type BF applied
parts, i.e. the light guide connection (flange) is insu-
lated from the rest of the instrument and from the
protective ground.
Symbols in t is user manual
The symbols used in this user manual have the following meaning:
Warning Indicates a potentially hazardous situation
or improper use that could result in seri-
ous personal injuries or death.
Caution Indicates a potentially hazardous situation
or improper use which, if not avoided, may
result in minor or moderate injury and/or
appreciable material, financial and envi-
ronmental damage.
Information about use that helps the user
to employ the product in a technically cor-
rect and efficient way.
Action required; this symbol indicates that
you need to perform a specific action or
series of actions.
➩

Introduction
4Leica HM500/Ref. 10 715 697/Version B
Overview
Leica H 500
1
3
4
5
6
7
9
10
11
12
8
1Monitor (optional)
3 Leica HM500 headset
4 Leica HM500 microscope
5 Leica HM500 suspension
6 Leica M RS (optional)
7 Leica MLS500 light source
8 Leica HM500 footswitch
9 Isolating transformer (optional)
10 Leica HM500 trolley (optional)
Leica H 500 Dental
as an alternative to the Leica HM500 footswitch (8):
11 Leica HM500 ental databox
12 Leica HM500 ental footswitch
Leica HM500 ental is not suitable for use in
operating rooms.

Controls
5Leica HM500/Ref. 10 715 697/Version B
Leica HM500 microscope
Headset
13 Stability adjustment knob (preset)
14 Top strap length adjustment knob
15 Removable headband
16 Adjustment mechanism
17 Socket for data cable between microscope and
Leica HM500 footswitch/ ental databox
18 Counterweight box (to minimize tilting moment)
19 Side strap length adjustment knob
icroscope
20 Tubes, adjustable
21 Housing
22 Protection shield with cover glass, replaceable
23 Socket for fiber-optic light guide
20
23
21
22
20
1314 15 16
19
18
17
13
Adjustment mechanism
24 Rotary knob for fine adjustment of height
25 Rotary knob for coarse adjustment of height and angle
26 Rotary knob for fine adjustment of angle
27 Rotary knob for swiveling the microscope
28 Knob (on other side) for coarse adjustment of angle
(three basic settings)
Variants:
Leica HM500 with camera, PAL
Leica HM500 with camera, NTSC
Leica HM500 SL with camera, PAL
Leica HM500 SL with camera, NTSC
Leica HM500 SL (Spot Light): is a variant of the
Leica HM500 with concentrated illumination in the cen-
ter of the field of vision, particularly suitable for deep
cavities.
Leica HM500 SL (Spot Light): Without sufficient ambient
light, the quality of the video image can be impaired.
Leica HM500 SL (Spot Light): In addition to the concen-
trated, center-weighted illumination, the field of vision
must be illuminated with an operating lamp.
24
25
26
27
28

Controls
6Leica HM500/Ref. 10 715 697/Version B
Leica HM500 footswitc
An acoustic signal is given when any button, switch or
rocker switch is operated.
29 Button for camera off
30 Rocker switch for manual focus (+/-)
31 Button for manual focus/speed focus
Holding this down will activate the autofocus
(speed focus function) (see page 27).
32 Button for autofocus
33 Rocker switch for variable zoom (+/-)
34 Charge level indicator
The charge level indicator (34) shows the charge level
of the battery in 20 % steps between 0 % and 100 %. All
5 yellow lights flashing means the battery is fully
charged and is ready again for use.
35 Button for camera on
Holding this down will activate the white balancing
function (see page 16)
29
30
31
32
33
35
34
Z+Z–
F+F–
Leica H 500 footswitch connections
36 On/Off switch
37 Socket for power pack cable
38 RS232 connection (for default settings)
39 Socket for camera output for example, to the moni-
tor(optional)
40 Socket for microscope-footswitch data cable
Color coding:
green = RS232 connection (38)
blue = camera output socket (39)
black = data cable socket (40)
36
38
39
40
37
On
Off

Controls
7Leica HM500/Ref. 10 715 697/Version B
Leica HM500 Dental footswitc
An acoustic signal is given when any button, switch or
rocker switch is operated.
41 Cable with plug for connection to the ental databox
42 Button for focus up
43 Button for manual focus/autofocus
Holding this down will activate the autofocus
(speed focus function) (see page 27).
44 Button for zoom down
45 Button for focus down
46 Button for zoom up
41
42
43
44
45
46
Leica HM500 Dental databox
Front view
47 On/Off switch
48 Charge level indicator
The charge level indicator (48) shows the charge level
of the battery in 20 % steps between 0 % and 100 %. All
5 yellow lights flashing means the battery is fully
charged and is ready again for use.
49 Switch for camera on
Holding this down will activate the white balancing
function (see page 16)
50 Switch for camera off
51 Socket for microscope- ental databox data cable
52 Socket for footswitch- ental databox footswitch cable
Rear view
53 Socket for camera output, for example, to the monitor
(optional)
54 RS232 connection (for default settings)
55 Battery compartment
56 Socket for power pack cable
Color coding:
black = data cable socket (51)
orange = footswitch cable socket (52)
blue = camera output socket (53)
green = RS232 connection (54)
54 55 5653
47
48 49 50
51
52
On
Off

Controls
Leica HM500/Ref. 10 715 697/Version B
8
Leica MLS500 lig t source
57 isplay for running-time meter
58 Connection for fiber-optic light guide
59 Rotary knob for diaphragm wheel (brightness control)
60 Rotary knob for filter wheel
61 On/Off switch (stand-by)
62 Strain relief device for power cable
63 Reset button for running-time meter
64 Fuse holder
65 Connection for potential equalization
66 Power cable
To disconnect fully from power supply, pull out the
power plug.
57 58 59 60 61
6263646566
Leica HM500 trolley (optional)
5 Leica HM500 suspension
9 Isolating transformer (optional)
67 VESA 100 flat-screen adapter
68 Power switch for isolating transformer
69 ouble casters, lockable
71 Connections for potential equalization
72 Shelf
73 Multiple socket outlet
74 rawer for accessories
75 Multiple socket outlet
See also the user manual of the Leica HM500 trolley.
67
9
68
69
71
73
74
75
72
5

Accessories
9Leica HM500/Ref. 10 715 697/Version B
Accessories
Power pack for Leica H 500 footswitch
For safety reasons we strongly recommend that the
footswitch only be operated with the battery and the
power pack only be used for charging the battery.
However, if the battery is discharged—as may be seen
from the charge indicator and also announced by an
audible signal when the charge level falls below
approx. 10 %–and it is not possible to break off work to
charge the battery (for example, an operation is in
progress), the microscope can also be operated on line
power.
Interchangeable eyepieces (optional)
76 Interchangeable eyepieces I – 14x: 2.0 - 4.8x magnification
77 Interchangeable eyepieces II – 26x: 3.75 - 9x magnification
76
77
Changing interchangeable eyepieces (optional)
Always change the eyepieces in pairs.
After removing the eyepieces, keep them in the pack-
aging to protect them against dust and damage.
➩Rotate the eyepiece (81) a little and remove.
➩Slide interchangeable eyepiece I or II in as far as the stop.
➩Rotate towards –7 dpt until the interchangeable eyepiece
latches.
➩Rotate the interchangeable eyepiece back to the 0 dpt posi-
tion (80) or compensate for defective vision (see page 17).
o not use excessive force.
Interchangeable eyepiece vision point
• 20x magnification
A black spot in the center of the eyepiece helps the
user consciously and more easily direct his vision to
the center of the operation field. The video picture is
shown correspondingly centered in the monitor. The
vision point is the reference point for autofocus.
Your Leica HM500 comes equipped with a vision point
eyepiece on the right-hand side as a standard feature.
80
81

Accessories
10 Leica HM500/Ref. 10 715 697/Version B
Integrated camera
• Integrated autofocus color camera with 1/2" CC
- Effective pixels 752 (H) x 582 (V)
- PAL or NTSC format
Headband
The headband can be
changed by opening and
closing the snap fasteners.
The old headband can be
disposed of as normal waste.
Neckband
The neckband can be
changed by opening and
closing the snap fasteners.
The old neckband can be dis-
posed of as normal waste.
Cleaning solution
The glass surfaces of the
Leica HM500 can be cleaned
with the Leica HM500 clean-
ing solution.
Used cleaning solution
should be disposed of in
accordance with national
regulations for the disposal
of chemicals.
Always spray the solution onto the microfiber cloth and
never directly onto the Leica HM500!
icrofiber cloth
The Leica HM500 microfiber
cloth is used for cleaning the
eyepieces and the cover
glass.
The old microfiber cloth can
be disposed of as normal
waste.
Eyeglass protection ring (eyepiece)
The Leica HM500 eyeglass
protection ring protects the
user’s eyeglasses from
scratches and so on.
The ring can be changed
easily.
The old eyeglass protection
ring can be disposed of as
normal waste.
Changing the eyeglass protection ring:
➩Carefully remove the old eyeglass protection ring.
➩Press the new eyeglass protection ring lightly onto the
eyepiece until the ring clicks into position.
All replacement parts can be ordered from your
Leica dealer.

Preparation Before Surgery
11Leica HM500/Ref. 10 715 697/Version B
C ecklist before t e operation
Check the charge level of the battery in the footswitch/Dental
databox
➩Press any button on the footswitch.
At least 4 LE s on the charge level indicator (34)/(48) must
light up (see page 27).
Check the headset adjustment
➩Check the headset and adjustment mechanism are perfectly
adjusted and correctly attached (page 17 onwards).
Connecting the fiber-optic light guide
➩Connect the fiber-optic light guide to the Leica MLS500 light
source and microscope (see page 22).
Connect the data cable
➩Connect the data cable to the microscope and Leica MLS500
footswitch/ ental databox (see page 14).
Check the microscope setting
➩Check the interpupillary distance, diopters and eye distance
(see page 18).
Switch on the Leica H 500
➩Switch on the Leica MLS500 light source at switch (61).
➩Switch the footswitch on at switch (36) or the ental databox
at switch (47).
The automatic instrument self-test now runs.
Automatic instrument self-test
Warning 1
Risk of eye injuries
➩o not look through the instrument optics while the
self-test is in progress.
➩o not use the instrument until the instrument self-test
is completed.
When the Leica MLS500 light source and the Leica HM500
footswitch or ental databox are connected by the data cable,
an audible signal will be heard when the footswitch is switched
on and the Leica HM500 will carry out an automatic instrument
self-test. At the end of the test an audible signal is given three
times.
The MLS500 light source starts automatically with the autofo-
cus option and the lowest magnification.
Check zoom and focus
➩Use manual focus.
➩Select the lowest magnification.
➩View a specimen at a working distance of 300 mm and
bring into focus by manual focusing via the footswitch.
➩View a specimen at a working distance of 700 mm and
bring into focus by manual focusing via the footswitch.
➩Select the highest magnification.
➩View the specimen as described above at working dis-
tances of 300 mm and 700 mm.
➩Switch over to autofocus.
➩View the specimen at different distances (300 to 700 mm).
➩Use the zoom at different distances (300 to 700 mm).
Switch on the camera
➩Connect the video cable.
➩Connect the camera to the footswitch or ental databox
(see page 15).
Select the focusing mode
➩Switch on autofocus or manual focusing (see page 27).

Preparation Before Surgery
12 Leica HM500/Ref. 10 715 697/Version B
Connecting t e Leica HM500
1 Monitor (optional)
6 Leica M RS (optional)
7 Leica MLS500 light source
8 Leica HM500 footswitch
75 Trolley multiple socket outlet
85
82
86
7
87
1
75 83
8
1 2 3 4
6
82 Leica HM500 with PAL/NTSC camera
83 Power pack (EU, UK, USA or Japan)
85 Fiber-optic light guide
86 Footswitch – microscope data cable
87 Video cable (S video)
Warning 2
Risk of eye injuries
• When lasers are used in combination with the Leica
HM500 microscope, it is the responsibility of the user
(laser safety officer) to ensure that eye protection is
sufficient and safe.
• For safety reasons, the protection class of the laser
safety glasses must be raised two classes (in accor-
dance with EN207) when standard eyepieces or inter-
changeable eyepieces I or II are used.
Secure the power cable for the Leica MLS500 light
source (7) to the rear of the Leica MLS500 light source
by means of the strain relief device (see page 22).
Plugging an additional multiple socket outlet into a
socket in the Leica HM500 trolley socket system is not
permitted.
Comply with the safety instructions for the
Leica HM500 trolley (see page 30).
black
blue

Preparation Before Surgery
13Leica HM500/Ref. 10 715 697/Version B
Connecting t e Leica HM500 Dental
1 Monitor (optional)
6 Leica M RS (optional)
7 Leica MLS500 light source
11 Leica HM500 ental databox (alternative)
12 Leica HM500 ental footswitch (alternative)
75 Trolley multiple socket outlet
85
82
86
7
87
1
75 83
1 2 3 4
6
11
12
11
blue
black
front side
back side
orange
82 Leica HM500 with PAL/NTSC camera
83 Power pack (EU, UK, USA or Japan)
85 Fiber-optic light guide
86 ental databox – microscope data cable
87 Video cable (S video)
Warning 2
Risk of eye injuries
• When lasers are used in combination with the
Leica HM500 microscope, it is the responsibility
of the user (laser safety officer) to ensure that eye
protection is sufficient and safe.
• For safety reasons, the protection class of the laser
safety glasses must be raised two classes (in accor-
dance with EN207) when standard eyepieces or inter-
changeable eyepieces I or II are used.
Leica HM500 ental is not suitable for use in
operating rooms.
Secure the power cable for the Leica MLS500 light
source (7) to the rear of the Leica MLS500 light source
by means of the strain relief device (see page 22).
Plugging an additional multiple socket outlet into a
socket in the Leica HM500 trolley socket system is not
permitted.
Comply with the safety instructions for the
Leica HM500 trolley (see page 30).
o not place the Leica HM500 ental databox (11) on
the floor.

Preparation Before Surgery
14 Leica HM500/Ref. 10 715 697/Version B
Connecting the Leica H 500
Caution 3
Danger of damage to the electronics
➩Always connect the data cable first and then switch
on the instrument.
➩Always switch off the instrument before disconnecting
the data cable.
➩Never plug or unplug the data cable when the green
light in the charge level indicator is on.
Observe the color coding when plugging the cable in.
➩Plug the data cable into the socket (17) on the underside of
the counterweight box (black color code).
Connect the Leica H 500 footswitch
➩Plug the data cable into the socket (40) in the footswitch
(black color code).
➩Switch on the footswitch and check to see whether the
footswitch battery is charged (see page 27).
40
39
17
Connecting the Leica H 500 Dental footswitch and Dental
databox
Observe the color coding when plugging the cable in.
➩Plug the data cable into the socket (51) in the ental databox
(black color code).
➩Switch on the ental databox and check to see whether
the battery is charged (see page 27).
➩Plug the footswitch cable plug into the socket (52) in the
ental databox (orange color code).
51
52

Preparation Before Surgery
15Leica HM500/Ref. 10 715 697/Version B
Connecting the integrated video camera
A1/2" CC autofocus color camera is built into your
Leica HM500.
Connecting the optional monitor
Observe the color coding when plugging the cable in.
➩Plug the video cable (87) into the socket (39) of the footswitch
(blue color code) and into the video input of the optional
monitor (S video).
or
➩Plug the video cable (87) into the socket (53) of the ental
databox (blue color code) and into the video input of the
optional monitor (S video).
39
53
87
Switch on the camera
➩Press button (35) on the footswitch or button (49) on the
ental databox.
Switching off the camera
➩Press button (29) on the footswitch or button (50) on the
ental databox.
The video picture does not cover the full field of view
(the rectangular video chip falls within the field of
view).
The quality of the camera image is affected to a great
extent by the quality and adjustment option of the
peripheral devices (e.g. for the monitor: color, contrast,
chrominance, phase for NTSC etc.).
49 50
29
35
S video

Preparation Before Surgery
16 Leica HM500/Ref. 10 715 697/Version B
Carrying out white balancing
Basically the camera has been designed for the normal
lighting conditions of an operating room. However, if
color problems occur you can carry out white balanc-
ing yourself.
Never carry out white balancing when the instrument
is being used, but always before!
o not carry out white balancing until the lamp has
been switched on for 5 minutes and has reached its
optimum operating state.
➩Using the Leica HM500 footswitch, zoom to the maximum
position (Tele)
➩Focus the camera on a flat white object.
➩Hold the "Camera on" button (35) of the footswitch down (for
about 10 sec.) or hold down the "Camera on" button (49) of the
ental databox until an acoustic signal is heard.
This activates white balancing.
➩Keep the button held down for 5 sec. or so until a slight fall in
brightness is noticed in the camera image.
➩Release the button and remove the white object.
This completes white balancing.
Keep focusing on the flat white object throughout the
process.
Connecting the optional DRS
➩Plug the video cable (87) into the socket (39) of the footswitch
and into the video input (S video) of the Leica M RS.
or
➩Plug the video cable (87) into the socket (53) of the ental
databox (blue color code) and into the video input (S video) of
the Leica M RS.
See also the M RS user manual.
Only use peripheral devices of electrical protection
class II (shown by the symbol ) for the SVHS output
(camera option).
o not touch the SVHS plug (when it is plugged in) and
the patient at the same time.
Use only medical peripheral devices (such as monitors,
video printers, video recorders, and so on) which sat-
isfy the requirements of the current edition of the
standards EN/IEC/UL 60601-1 (and also any parts
EN/IEC/UL 60601-2-xx which may be applicable. These
peripheral devices may only be used outside the
patient environment. Carefully read the user instruc-
tions and warning notes of the peripheral devices. The
relevant national medical standards must be observed.
1234
S video
M RS

Preparation Before Surgery
17Leica HM500/Ref. 10 715 697/Version B
Compensating for defective vision
The Leica HM500 microscope is equipped with an eyepiece for
eyeglass wearers.
Make absolutely sure that the eyepiece is in the
0-diopter position (80) when you are wearing eye-
glasses or contact lenses!
Alternatively, if you have defective vision in the spherical range
(nearsightedness or farsightedness) and are not wearing your
eyeglasses or contact lenses, you can adjust the eyepiece from
+7 diopters to –7 diopters to compensate.
Pre-setting the angle
➩Press the button (110) and put the microscope into one of the
three basic angle settings. The microscope clicks into posi-
tion.
110
80
Adjusting the headset
Before it is used for the first time, the headset needs to be
individually adjusted.
➩Hold the microscope with both hands on the headset and
place on the head as shown.
➩Check the position of the microscope.

Preparation Before Surgery
18 Leica HM500/Ref. 10 715 697/Version B
Adjusting the length of the headband
➩Loosen the middle knob (13) on the back.
➩Adjust the length of the headband.
➩Fasten the knob (13) again.
Adjusting the side strap
➩Turn the knob (19) until the side strap fits snugly.
The headset must sit comfortably on the head without slipping.
Adjusting the top strap
➩Turn the knob (14) until the top strap fits snugly.
14
19
13
Adjusting the interpupillary distance
The interpupillary distance (distance between the centers of
the pupils of the right and left eyes) is adjusted by slightly mov-
ing the two outer tubes. A scale is provided on the back of the
microscope to help you find the interpupillary distance more
easily. o not apply excessive force to the instrument and use
both hands to make the basic setting.
Hold the tubes by the black rings when making adjust-
ments.
Make this adjustment carefully as you will not get the
best image unless the setting corresponds to your
particular interpupillary distance.
➩View an object within the working distance and with both
hands slightly swivel the two outer tubes (20) until you have
a perfect image.
Help in adjusting the interpupillary distance:
➩Set to manual focus.
➩Choose the maximum magnification and keep to the same
working distance (e. g. 600 mm).
➩Close your left eye and look at the image below.
➩Open your left eye and look at the image with your right eye.
If the image remains crystal clear and does not move when you
change eyes, this indicates the interpupillary distance has been
set optimally.
20