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Hi Lester
At F 4.5 what focal lenght would that equate to, meaning the tube could be fairly short i expect.
Do you still have the tube as well, by chance.
I have an 8 inch f 7.0 newt, and that has a focal length of approx 56 inches.
Also what is the condition of the mirror, i presume it would require re Aluminizing
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