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Re: Focal Length: How To Detemine For A Parabolic Mirror

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Posted by Kip Crawford on October 29, 1999 21:33:59 UTC

What does the instructions say? If it tells you where the focuser is and how long the tube is then you can figure it out easier. If your tube is 48" to 49" long, then the f ratio is deffinatly f/6. You can do the sun method, better use two people to do that, remember it can be dangerous. You can do the same thing with a flashlight also. If it is a Coulter kit, it is a f/6. I can bet on it. Check the mirror very carefully, there might be a clue to its' f ratio. Good Luck!!

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