math
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Optics/magnification practical question/field test
Hello,
I'd like to know if there is any test I can do to gauge how many times does a binoculars or telescope magnify, so to see if it is an 8x, 10x etc.
I was thinking about using a ruler at different distances that the telescope can focus on, or yet using something which is of human-treshold
visualizable size, though I can't square out a working method.
Thank you 
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bfesser
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Are there any markings at all on your binoculars or telescope (other than "Made in China")? If so, type them out or attach a photo, and I'll either
tell you how to interpret it or look up the magnification. If not, I'll have an excuse to dig out my optics books.
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math
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Quote: Originally posted by bfesser  | | Are there any markings at all on your binoculars or telescope (other than "Made in China")? If so, type them out or attach a photo, and I'll either
tell you how to interpret it or look up the magnification. If not, I'll have an excuse to dig out my optics books. |
Yeah, there is the classical AxB number where A is the magnification and B is the larger lens diameter in millimeters.
However I'd like to know if there is a simple test I can perform to check if that 10x30 I have (or anything like that) is really a 10x magnification,
since measuring the 30mm larger lens of course is not the problem.
Thank you
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