Using the Diopter on Your Binoculars

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I was at the range this weekend past weekend when I let a guy use my Zeiss Conquest 12X45 Binoculars. I mentioned to him that the binoculars where personalized to me so they might be a little blurry in one eye. When I said that he gave me a funny look and said how can they be personalized to your eyes. I then explained to him how to use the diopter on the binocular. He had no clue personalizing them to your eyes could be done. I guess it amazes me that people have the equipment but do not know how to use the stuff to the fullest potential.

Using the diopter, most of you may already know how this is done. Most binoculars will have the right eye as adjustable. Some will have the adjuster right on the rubber; some will be in line between the two tubes. Once you have found the adjuster, you can now adjust the binocular to your eyes. Find an object about 100yards away. Either close your right eye or cover the end of the binocular on the right side. Adjust the focus on the object of choice for your left eye. Once you are good and focused close your left eye or cover the left side of the binocular. This time when focusing on the same object you will adjust the diopter to focus your right eye, instead of the main focus adjuster. Once you have your right eye piece adjusted and focused on the same object as your left eye your binoculars are now adjusted to your eyes. From here on out you will only adjust the main focus knob. Now most diopters can be adjusted +/- 3.0 dpt. This is not that much but might be enough to make a big difference.


GooseHunter Jr's picture

That is a great tip it will

That is a great tip it will help alot of people that did not know that.  My dad kept using my binoualrs at camp this past antelope season and kept saying he could not get them to focus.....finally had to tell him that beacsue they are "mine".  he did not know of the second adjustment either.  That is a really good tip for all levels of hunters...nice jib!

BikerRN's picture


This is a great tip!

I didn't know how to adjust my binoculars, although I had heard it talked about in the past, and now it makes sense. Before it was like someone was speaking Greek to me, a language I am not fluent in, and it made no sense.

I'm going to copy and print your Tip so I can remember how to do it when I go out tomorrow. I'll have my range finder, so looking at something 100 Yards away will be easy. Thanks again and have a Happy Thanksgiving. Me, I'll be calling coyotes tomorrow, Thanksgiving.


groovy mike's picture

I don’t even know if my binoculars have that adjustment....

Thanks for the tip. I don’t even know if my binoculars have a second adjustment – let alone how to properly use it - so I appreciate the advice and will try to figure it out. Now I have a good excuse to play with every one of the half dozen or so sets of binoculars laying around the house again! Of course that just means that they’ll work for me and everyone else will have to close one eye though…..

Retired2hunt's picture

  Definitely why the finer


Definitely why the finer binos are built that way.  This is a great tip for those that do not take the time to read the instructions on how to properly use the equipment you spend so much on.

I would add that each year you should re-adjust your diopter.  Your eyesight does change and so must your diopter to allow you continued excellent performance.

Most finer rifle scopes also have this feature but for the one eye being used.  Here too you should re-adjust every year as your eyesight may have changed.

Great tip and thanks for sharing with all of us!


COMeatHunter's picture

I agree, most folks like to

I agree, most folks like to buy high end equipment but then never take the time or put in the effort to get the most out of it.  This is a great example of having the ability to make your equipment work really well FOR YOU.  And once you've set the diopter on your binoculars, you can also usually lock the setting and not be worried about it changing while hunting.

The other point here is pretty simple too.  If you do make this adjustment your binoculars will perform really well for you and limit eye fatigue and strain.  You'll be able to use them comfortably for hours.

Thanks for the tip!  

hunter25's picture

Good tip and information.

Good tip and information. Mostly common knowledge but I've found many new people that don't read the directions at all adn would probably miss this. Scopes need to be slightly adjusted as well to be perfectly ready to use.