My distance right now is about 7 to 10 inches. Do I have to buy a different eyepiece because the one I have now I can't see anything unless I put it right up the secondary mirror?
2007-05-14 07:54:51 · 2 answers · asked by Anonymous in Science & Mathematics ➔ Astronomy & Space
The focal length of the primary mirror (to the nearsest 1/4 inch) is needed, first.
The radius of your optical tube assembly, plus the distance of your focuser, plus the distance from the center of the primary mirror to the secondary mirror, all has to add up to focal length.
There will be some "play" in the focuser, so the placement of the secondary mirror doesn't have to be precise, but it should be within 1 inch of the target distance.
It sounds like you placed your secondary mirror too far away from the primary mirror. Move the spider in toward the primary (the proper distance), and cut a new hole for the focuser in the tube 90 degrees away from the old hole (and cover the old hole with some opaque material).
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2007-05-14 08:22:23 · answer #1 · answered by tlbs101 7 · 2⤊ 0⤋
Use a ruler DUDE!!!!
Don't waste money. Ask for professional help!!!!
2007-05-14 07:59:11 · answer #2 · answered by martinpaul2001 3 · 0⤊ 1⤋