Binoculars relative exit pupils

Seeing The Exit Pupil


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41 shares, 33 points

Exit Pupil Diagram
Exit Pupil Diagram

Q: In your test reports dealing with scopes you mention the exit pupil, but you don’t say how you can actually see it. Is there any way I can get a look at the exit pupil in my scope?

Carl Jennings

A: You can look at the exit pupil by holding your scope at arms length and noting the small circle of light in the centre of the ocular (rear) lens. Its diameter can be calculated by dividing the diameter of the objective lens by the magnification of the scope. If you have a variable power scope, the size of the exit pupil will change with the magnification.

Too-large exit pupil of no use.
Too-large exit pupil of no use.


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41 shares, 33 points

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Nick Harvey

Nick Harvey is one of the world's most experienced and knowledgeable gun writers, a true legend of the business. He has been writing about firearms and hunting for more than 65 years, has published many books and uncounted articles, and has travelled the world to hunt and shoot. His reloading manuals are highly sought after, and his knowledge of the subject is unmatched. He has been Sporting Shooter's Gun Editor for longer than anyone can remember. Nick lives in rural NSW, Australia.

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