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FOCAL LENGTH

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Posted by Scott on January 16, 2002 06:06:35 UTC

Can someone explain how to determine where to cut the focuser hole in my 10" dDobsonian? I have a 10" F5 primary and 2.5" secondary in a 12" tube. I also have a 2" focuser. Do I need to find the actual focal length of the primary? If so, what is the best way. I have been told to use a flashlight and piece of paper. Is there a better way? I would like to do it right the first time. Please be specific as this is my first time building a telescope. Thanks, Scott

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