[woodhornbirder]

32xwide...

http://www.astromart.com/classifieds...fied_id=696875

has this chap got the right info about it being a 80deg ep ?

I thought they were 72 deg?

[John Russell]

131ft FOV @ 1000yds with 32x magnification translates according to ISO 14132-1 to an AFOV of 69,9°.

John

PS: taking the figures for the Televid 62 the AFOV is 70,8°. Presumably one or both magnifications are not true integers.

[henry link]

At angles this wide there's a large discrepancy between the ISO method and the simple calculation (real field in degrees multiplied by magnification). In this case the simple method results in 79.85 degrees. That must be where the idea of 80 degrees comes from.

The ISO method is only correct for a distortion free field which is impossible at such a wide angle. I haven't seen this eyepiece, but if we assume Leica uses some pincushion distortion as in their binoculars that would make the "real" apparent field larger than the ISO calculation by some unknown amount. Depending on how much distortion is used the AFOV probably falls somewhere between 72 and 76 degrees.