Looking for information about Dynamax 6 SC
Posted 18 November 2005 - 09:05 AM
What I didn't receive was a manual.
Would anyone have any idea where I might be able to find one?
Posted 18 November 2005 - 11:00 AM
Posted 22 November 2005 - 09:06 PM
I have the Dynamax 6 & 8 owner manual in pdf format, if you want a copy send me a PM with your e-mail adress.
Posted 24 November 2005 - 12:11 PM
Posted 29 November 2005 - 11:55 AM
Views through a 32mm eyepiece (about 48x) were good. Views through a 20mm Televue Plossl (about 76x) were okay, but a little fuzzy. Views through a 6mm eyepiece (about 250x) simply wouldn't come to anything that resembled focus.
My target was a radio tower about 2 miles away, so the atmosphere wasn't much of a consideration.
The scope has four optical surfaces. From what I've read elsewhere, the corrector was built by taking a piece of plate flat glass, pulling it against a mold with a vacuum and grinding/polishing the other side. Assuming the engineers knew what they were doing (and I have no reason to assume otherwise), I'd expect the following to be true:
1) The primary mirror is fine. It's a spherical surface, and
I'd be amazed to find a problem there.
2) The secondary mirrir is fine. It's probably spherical. Same comments as the primary.
3) The oddly shaped side of the corrector is fine. If the mold was built correctly, then all they had to do was grind and polish the exposed surface. If there were small imperfections in side of the corrector that was held against the mold, those imperfections may have had no impact in how the glass was held against the mold.
4) The surface that was vacuumed against the mold could be the problem. Potentially, all I need to do is grind this flat. It might be worth it to test the 'flat' side to see how flat that corrector is.
5) Variations in the glass of the corrector could be the
problem. My only option here would be to make a new corrector.
Let's assume that #4 is correct.
How do I polish the 'flat' side so it really is flat? It certainly wouldn't make sense to try and BUY a corrector somewhere when I only spent $80 on the entire scope + tripod.
Posted 30 November 2005 - 04:01 PM
On a schmidt corrector, the "correction" is something like 70-80 waves of spherical abberation on the aspheric side selected to cancel out the contribution from the spherical mirrors. So the tuning of the pair is more likely to be off than the unflatness of the plano side.