Collimating large binoculars

Collimating large binoculars
If you look through a pair of binoculars and see two of
everything it means that the optics are out of alignment,
they are “out of collimation”.
This can happen if the binoculars have had a slight knock
or can just happen through normal wear and use. It can
happen to all binoculars but larger more powerful
binoculars are more susceptible as the magnification
makes the double image effect more pronounced,
Unless your binocular has sustained severe damage, in
most cases they can be re-collimated quickly and easily.
Your dealer can usually offer this service though with
some binoculars the adjustment is very straightforward
and you may wish to do this yourself.
If the body cover does lift
easily to reveal the collimation
adjustment screws, DO NOT
force it as you may damage
the product. Consult your
Many large binoculars have a soft rubber body covering
which allows easy access to the adjustment screws. Gently
lift the rubber around the shoulder of the binocular, if it lifts
easily and reveals a screw ( there are two, one on each
side ) then the adjustment can usually be made quickly. if however the body is solid or there are no apparent
screws then the collimation screw positions may be harder to access and you should
consult your dealer.
Aim and focus the binoculars on a distance object, a church tower is usually a good
choice. You’ll see two images if the binocular is out of collimation. We suggest mounting
the binoculars on a solid tripod, this makes it easier to work on the binocular while it is
kept pointed at the object. Use a correct size jewellers screwdriver to slowly adjust the
screws.
You will see that the screw on one side of the binocular moves the images along a line,
together or apart, depending which way you turn the screw. The screw on the other side of
the binoculars moves the images together or apart on a line at 90degrees to the first. By adjusting the two screws
alternately and gradually you can bring the images into alignment. For safety do not try to adjust whilst viewing
because the screwdriver may slip and cause injury. If in doubt, or if the collimation procedure cannot be achieved
easily, then consult with your dealer.