I have to replace my secondary mirror on my 114mm by 910mm 4.5 f/8. And yes I made a big boo boo I rubbed through the aluminization on the mirror. How important is it to have a perfect match and what suggestions might you have. In desperate need. Thanks....Al
Replacing the secondary mirror???
Started by Dimpa, 03/06/2006 10:36PM
Posted 03/06/2006 10:36PM
Opening Post
Posted 03/06/2006 10:42PM
#1
I have to replace my secondary mirror on my 114mm by 910mm 4.5 f/8. And yes I made a big boo boo I rubbed through the aluminization on the mirror. How important is it to have a perfect match and what suggestions might you have. In desperate need. Thanks....Al
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Albert:
Sorry about your difficulties, the primary rule of dealing with telescope mirrors is whatever you think you need to do, DON'T DO IT!!
You can have your mirror recoated for a small price, probably easier than buying a new one, though a new one would be quite inexpensive as well.
It is best if you have a good match because otherwise it won't fit in the mirror holder. You might get them both coated at once.
One place that does good work and is inexpensive is L&L Optical, www.llopt.com
jon
Jon
-----------------
Albert:
Sorry about your difficulties, the primary rule of dealing with telescope mirrors is whatever you think you need to do, DON'T DO IT!!
You can have your mirror recoated for a small price, probably easier than buying a new one, though a new one would be quite inexpensive as well.
It is best if you have a good match because otherwise it won't fit in the mirror holder. You might get them both coated at once.
One place that does good work and is inexpensive is L&L Optical, www.llopt.com
jon
Jon
Posted 03/06/2006 10:55PM
#2
It is not absolutely critical to have the exact match. As a matter of fact, there is some argument about just how big a secondary mirror needs to be, and the argument stems on decisions on what percentage you want fully illuminated.
These things come in somewhat standard sizes.
Measure how wide the mirror is at its narrowest point.
Meanwhile, one of the other members of this Forum will know (and please tell us) which of the many Forum sponsors sell secondaries.
Alex
These things come in somewhat standard sizes.
Measure how wide the mirror is at its narrowest point.
Meanwhile, one of the other members of this Forum will know (and please tell us) which of the many Forum sponsors sell secondaries.
Alex
Funding Member
