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These would be the Vixen 125 that I saw at NEAF. They were displayed at NEAF with what is supposed to be a fixed power 30x eyepiece. At that time I called the Vixen rep over to the display and I pointed out that the exit pupil SHOULD be 4.2mm. I showed him that the exit pupil was 3.8mm. The cause of thee reduction was not clearly apparent, but he agreed the reduced exit pupil was apparent.

Causes could be several:

..perhaps the eyepieces were not a focal length that produced 30x but they were giveing 33x.

..there may have been baffels intruding into the light cone path before the light reached the prisms

..the prism aperture could be sized such that the entire light cone cannot pass.

Either one or more of the above is reducing the exit pupil on this big binocular.

edz

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The 125mm model that you saw at NEAF is what is currently on the Vixen website ; the 125mm binocular I'm talking about with interchangable 1 1/4 inch eps is not yet released in the US. Supposed to be two entirely different animals.

We'll see...

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