Binoculars relative exit pupils

Seeing The Exit Pupil


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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Nick Harvey

The late Nick Harvey (1931-2024) was one of the world's most experienced and knowledgeable gun writers, a true legend of the business. He wrote about firearms and hunting for about 70 years, published many books and uncounted articles, and travelled the world to hunt and shoot. His reloading manuals are highly sought after, and his knowledge of the subject was unmatched. He was Sporting Shooter's Technical Editor for almost 50 years. His work lives on here as part of his legacy to us all.

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