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Looks like your 16X80 Vixen has wider 4.3 deg FOV.

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Rarely do we ever see a binocular advertised at 70° Afov that actually turns out to be 70°.

Even more rarely do we see a binocular with 70° Afov that is well corrected in the outer fov. Simply because it is very difficult to make well corrected 70° eyepieces, and especiallly to put two of them in a reasonably priced binocular.

It would be interesting if this were such a model.

Here's a few easy measures to check

4.0° 7 UMi to 15 Umi, not completely across the top of Little Dipper Cup
4.1° 23 Dra to 33 Dra, Beta to Gamma draco, south side of Draco head
4.3° 10 CMi to 3 CMi, alpha (Procyon) to Beta Canis Minor

edz


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