ENGLISH
Selection table for optical device insert rings
Cover adapter 
model
The internal diameter of the insert needs to match the outer 
diameter of the objective lens housing of the daylight optical 
device it is being installed on.
Insert internal 
diameter, mm
Suitable for lens housing of daylight 
optical devices with an outer diameter 
of, mm
Cover adapter 
FN 42mm
45.5 45.5
46 46
46.5 46.5
47 46.7-47.6
48 47.7-46.7
49 48.7-49.6
50 49.7-50.6
Cover adapter 
FN 50mm
51.6 51.6
53.4 53.4
55 54.7-55.6
56 55.7-56.6
57 56.7-57.6
58 57.7-58.6
59 58.7-59.6
Cover adapter 
FN 56mm
60 59.7-60.6
61 60.7-61.6
62 61.7-62.6
63 62.7-63.6
64 63.7-64.6
65 64.7-65.6
Powering On and Image Setup
• 
Remove the lens cover (1) by turning it counterclockwise.
• 
Turn on the device by pressing the ON (9) button. An image will appear on 
the display after a few seconds.
• 
Adjust the eyepiece diopter ring of your daylight optical device until the 
symbols in the display are sharp. In future, it will not be necessary to adjust 
the eyepiece diopter, regardless of the distance and other conditions. 
• 
Rotate the lens focus knob (10) to focus on the visual target.
• 
Basic settings (brightness and contrast adjustment) can be altered by using 
the quick access menu.
• 
Enter the quick menu with a short press of the M (7) button.
• 
A short press of the M (7) button enables you to switch between functions, as 
described below.
  - Brightness 
 – by pressing the RIGHT (6) and LEFT (8) buttons 
and changing the display brightness value from 0 to 20.
  - Contrast 
 – by pressing the RIGHT (6) and LEFT (8) buttons 
and changing the display contrast value from 0 to 20.
• 
Turn the device off after use with a long press of the ON (9) button.
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