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Focal Length

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Posted by John Smith on October 29, 2002 01:51:25 UTC

Thanks,

I was aware that focal length was half of R.O.C. I wasn't sure if the way I was going about finding the R.O.C was going to be accurate enough for my purposes. I was trying to hold the filament of the flashlight bulb on the same plane as the board I was focusing the reflection on. I moved the board until the reflection of the light was it's smallest, any closer to the mirror or any further from the mirror, the reflection got larger.

I was asking about how to measure the focuser for finding out where to cut the hole in the tube because I have a 2" 52mm eyepiece, a 2" zoom eyepiece and some 1 1/2 inch eyepieces. I'm wanting to make sure that I will be able to bring all of them to focus.

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