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Does the 5100 have the "Live View" function which allows you to put a magnified view of a star on your LCD screen? If it does then used in conjunction with a Bahtinov mask, perfect focus is simple. If it doesn't
have the function you will have to use the brightest available star to
focus with when using the mask.
There is no one conversion factor, as different cameras can have different size pixels.
raymo
Last edited by raymo; 23-03-2015 at 02:46 PM.
Reason: more text
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