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Tube Length

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Posted by Josh Miller/">Josh Miller on May 21, 1999 06:58:58 UTC

I have a lens with a back focal length of 18-19 inches. The focuser I am using is 3.5" tall and has a focus travel of 6". I am going to use a 2" diagonal. I think that the tube should be 8-11 inches long, but I am not sure of the exact length. Can anyone help me Thanks

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