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I used tripod, removed eyecups and framed view using M45. Yellow circle (12.7 degrees) is what I saw. Red circle is Miyauchi spec 13.2 degrees.

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That's quite a surprising result. I spent some time tonight measuring the FOV of my pair and found that Cassiopeia was a good test. Segin to Schedar is 11°34' and try as I could, I was unable to get both stars visible at the same time. I was able to position the FOV so that neither star was visible. From this, I estimated the FOV of my binoculars to be about 11°20'. This was with the eyecups rolled all the way back so the full field was visible. But I was not rolling my eyes around the field edge - I was looking dead center and testing to see if I could see the stars on the edge.

I think the original figure of 13.2° came from someone guessing that the eyepieces had the same 66° FOV as other Miyauchi EP's that look similar. But my pair at least, very definitely do not have a 66° FOV - it is very noticeably narrower.

It's hard to believe there is that much variation between binoculars, although it may be that mounting the binos on a tripod and then looking at all angles will see more.

Can anyone else with these Binons take a quick peak at Cassiopeia and see if you can catch Schedar and Segin in the same FOV with the eyecups rolled back?

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