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Anonymous
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Re: Stellar Separations for Determining Field of V
05/07/04 12:13 AM
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Quote:
Now we have these wonderful measuring aids , perhaps we could all post in the ACTUAL True Fields of View of all our binoculars ?
The two stars at the end of Ursa Major's handle are 6.66 degrees according to the diagram. They virtually *exactly* fit in the f.o.v. in my cheap Omcon 7x50s (Made in Japan, about 10-15 years old). I wasn't wearing glasses, so I can see the full field of view available. So:
Stated f.o.v: 6.8 degrees
Actual f.o.v.: approx. 6.66 degrees
So it's exaggerated by about 2%. Disappointing, but nowhere near as bad as Orion Ultraview 10x50s which are advertised at 6.5 degrees, and are actually closer to 6.0 degrees. I've never seen any binocs with actual f.o.v. or eye relief greater than the specs...it's always the same or less. If it were simply discrepancies in measurement, you'd expect that, (based purely on chance), the measured spec would be better than the stated spec about as often as it being less. It's simple: most binoc manufacturers intentionally exaggerate...lie.
I wish there was an international standard that binoc manufacturers could volontarily abide by, which would read something like:
"In compliance with the International ______ Standard, we guarantee that our binoculars comply with the stated field of view specifications to within +/- 2% and eye relief to within +/- 4%." or something similar.
When I have time I'll try to measure my 20x50s and 10x25s. I'm hoping others will post measurements...I'd love to see how they compare to the specs, and perhaps we could get to know which binoc manufacturers are generally the worst offenders at exaggerating f.o.v., and which are the most reliable.
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