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This is one of the easier calculations in optics. Apparent FOV is simply the True Field of View times magnification(or power).

A 20X binocular with 3.5 deg FOV will have APFOV of 20X3.5= 70 deg.

Most binoculars list TFOV or how many feet/1000 yards. For example my Eagle Optics 8X32 has FOV of 393 ft at 1000 yds. One deg FOV is ~52.4 ft/1000 yards. My EO has TFOV of ~7.5 deg or 60 deg APFOV.

Mike's Vixen 16X80 is listed as having FOV of 4.3 deg. APFOV is 68.8 deg. Fairly wide for a EP.

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Yes, this is an easy calculation. But maybe 7 out of 10 binoculars do not measure up to the Tfov specs as listed. So you can't trust the specs. We've known that here for a long time. That's why I have given the needed information to actually measure the TFOV. I would love to have my suspicion proven wrong.

edz

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