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Eyepiece Diameter | Optics Trade Debates

Welcome to Optics Trade debates. In each episode, we talk about a different topic and try to answer the most common questions we receive about it. Today, we are going to talk about the eyepiece diameter.

The eyepiece diameter is the outer diameter of the eyepiece. The eyepiece lens can’t be measured and that’s why the external diameter of the eyepiece is the next best thing.

Most people that buy a scope want to protect it. So, if covers aren’t included, a lot of people buy aftermarket lens protectors. The eyepiece diameter is an important piece of information when buying lens protectors.

The eyepiece diameter isn’t always included, so when buying covers, the diameter of the eyepiece needs to be measured.

Swarovski has the same eyepiece diameter on all Z6 and Z8 riflescopes. So, a 46 mm Swarovski flip-up cover fits on all scopes from this two series.

Kahles has two different eyepiece diameters, 43 mm and 46 mm.

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Explanation of the term on our website:

Eyepiece or ocular diameter is the outside (housing) diameter on the rear side of a rifle scope, directly where you look in the rifle scope itself.

The outside diameter of the eyepiece does not affect the quality of the picture, but it is an important information for users of bolt-action rifles. This dimension is important when mounting the rifle scope because you have to take into account how far your bolt handle is coming up when reloading. If the eyepiece diameter is too big, it can happen that the bolt hits the eyepiece. 

The eye-piece diameter is also an important information when buying a wide-angle rifle scope and the suitable mount for it, because the eyepiece is usually bigger than the main tube, so consequently the user has to calculate the height for the mount from the eyepiece diameter and not from the objective diameter as usually. 

eyepiece diameter 1

Source: Revija Lovec

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