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My Newts seem to be long so small secondary are installed. 12.5" f/7 =
1.5, 16" f/7 = 2 and 6" f/4 = 1.5. Yeah, but it works great. My question is for a telescoper, scopist, why not keep more than one size around? Anyway, a little smaller secondary will not dim the edge too much anyway. When I first made the 6" f/4 back in, wow 35 years ago!!!!, I used a 1.86" and later on tried a 1.5-inch just for kicks. It worked great! So, I just left it in. I can't see wide field stuff so good these days so observe at 100x - 200x with it. One should walk on the edge at times. |
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PLONK!
-- Jan Owen To reach me directly, remove the Z, if one appears in my e-mail address... Latitude: 33.662 Longitude: -112.3272 "DustyMars" wrote in message .. . In article . com, says... My Newts seem to be long so small secondary are installed. 12.5" f/7 = 1.5, 16" f/7 = 2 and 6" f/4 = 1.5. Yeah, but it works great. My question is for a telescoper, scopist, why not keep more than one size around? Anyway, a little smaller secondary will not dim the edge too much anyway. When I first made the 6" f/4 back in, wow 35 years ago!!!!, I used a 1.86" and later on tried a 1.5-inch just for kicks. It worked great! So, I just left it in. I can't see wide field stuff so good these days so observe at 100x - 200x with it. One should walk on the edge at times. Just think of community relations by keeping a bunch of secondary mirrors around. People borrow them and you borrow stuff from them. Why, there must be mirrors laying around people's closets all over south Florida! I know of at least three secondaries that friends have. w ho knows what of their's I have I designed my 16" to use a 1.83" sec., but have installed a 1.5" and it worked very well on Mars. Like the 6-inch f/4, using certain eyepieces, i.e., Clave, Radian, Neglar, 10mm to ~5mm the field stops are small and the illuminated field more than covers the eyepiece field lens or stop. ATM'ers, or even catalog amateurs, should have a few extra parts around so to experiment and then they would not have to wade through the bull **** on s.a.a. to get an answer -- they could figure it out fro themselves. Hell, they could even discuss the issue. -- RustyMars "Nothing is rich but the inexhaustible wealth of nature. She shows us only surfaces, but she is a million fathoms deep." ....Ralph Waldo Emerson |
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