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Wearing glasses. Marine-3 binoculars deliver full field 
of view with or without glasses. To ensure the maximum 
available field of view is obtained, the fold down rubber 
eyecups fitted to each eyepiece housing should be in the 
‘down’ position when viewing with glasses. Be sure to 
return the eyecups to the ‘up’ position if you or anybody 
else wants to view without glasses.

Care and cleaning. Marine-3 binoculars require little 
maintenance but occasionally the outside surfaces of the 
eyepieces and objective lenses will need cleaning. To 
avoid damaging these surfaces please read the following 
carefully. 
(i)    Gently remove excess dirt and dust using a 

compressed air device or blower brush. Caution: 
Hard and persistent rubbing of dirty surfaces can 
cause abrasive scratches on the surface of the glass 
which may distort viewing.

(ii)   Breathe on exposed glass surface and then wipe with 

an optical cleaning cloth (code 30277) in a circular 
motion until the surface is clean again.

Do not attempt to dismantle the instrument as this will 
invalidate the guarantee.

We hope you will get a great deal of pleasure from your 
new Opticron binocular. If you have any problems 
or damage the instrument in any way our Service 
Department is on hand to help you.

To help you get the best results from your equipment, 
please read the following instructions carefully.

Adjusting to obtain a single picture. To adjust the 
binoculars to match the spacing of your eyes simply 
rotate the two sides of the instrument around the center 
hinge until a single rounded picture is obtained when 
looking through both eyepieces.

Adjusting for maximum sharpness (focusing). Marine-3 
binoculars feature individual eyepiece focusing but the 
large depth of field generated by the 7x50 specification 
means they deliver focused images from approximately 
50 yards to infinity distance. As a rule for general 
observation over 50 yards, the binoculars can be ‘set’ 
with the zero marks on the eyepiece tubes positioned 
directly above the vertical line marks on the main body. 
Focusing at close range (below 50 yards) is facilitated 
by turning the left and right eyepieces simultaneously 
anticlockwise.

Adjusting for differences in visual acuity. Some people 
have differences in strength or visual acuity between 
their eyes. To compensate for this the eyepiece tubes 
can be rotated to different positions (usually within a few 
degrees of each other) for any given distance.

User Instructions

Main Features

A   Fitting point for removable objective lens covers 

(supplied)

B   Integral tripod adapter socket - unscrew to fit 

31005 large L mount (optional extra)

C   Lightly textured rubber armoring contoured for 

comfort and handling with or without gloves

D   Long eyerelief eyepieces for comfortable viewing 

with or without glasses

E   Fold down rubber eyecups

Model supplied in soft case with wide neck strap, 
rainguard and integral objective lens covers.

WARNING. Never under any circumstances use a 
binocular to view the sun. Doing so will cause serious 
damage to your eyes.

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A

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D E

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