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Originally Posted by Stephen Fox
I can see a rangefinder is used as an instrument to ascertain distance from it to the subject. I guessed at focus aid, I believe to be correct but what's the difference, if any between rangefinder and focus aid?
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Stephen,
None really. I guess that 'range finder is more specific because it finds the range, whereas a magnifying glass could be used as a focus aid but not as a range finder. The term 'focus aid,' is often used to describe a specially mounted magnifiying mirror used with enlargers during wet printing.
John