Click here if you are having trouble logging into the forums
Privacy Policy |
Please read our Terms
of Service | Signup and
Troubleshooting FAQ | Problems? PM a Red or a Green Gu.... uh, User
refractory
Pooh-Bah
Reged: 02/05/05
Posts: 1014
|
|
Anyone know how flat optical comparator mirrors are? Good enough for large binoculars? Hi mag for telescopes when redirecting light to the objective? Thanks.
Jess Tauber
|
Crab
super member
Reged: 02/23/05
Posts: 111
|
|
Not very flat. If you do a search of this forum for "comparator" there are a couple of threads that talk about it. One example was a representation from Scherr-Tumico(my guess) that stated a spec of about 8 waves and the other was a test of a J & L unit with about .75 waves of astigmatism. Based on those limited examples binocular use if you are lucky would be about it.
|
refractory
Pooh-Bah
Reged: 02/05/05
Posts: 1014
|
|
OK thanks- what about as a chunk of glass to make a primary out of- do you know if good enough? Thanks again.
JT
|
Celticmoon
journeyman
Reged: 07/10/08
Posts: 5
Loc: Nashua, NH
|
|
I was cleaning my comparator and was thinking the same thing. Those mirrors are BIG. Too bad they're too thin and not really designed for high optical quality.
--------------------
Orion XT-8
ETX-80 AT-TC
DS-114
|
Crab
super member
Reged: 02/23/05
Posts: 111
|
|
If the glass passes a polarizer test for strain then it should work as a blank. That assumes some reasonable thickness of course. Glass type may be plate or pyrex or possbly something else. Mine is plate. I haven't analyzed it for strain yet.
|
|
16 registered and 8 anonymous users are browsing this forum.
Moderator: Don W, Joe Cipriano
Print Thread
|
Forum Permissions
You cannot start new topics
You cannot reply to topics
HTML is disabled
UBBCode is enabled
|
Thread views: 188
|
|
|
|
|
|
|
Previous
Index
Next
Threaded
Edit
Reply
Quote
[Re: 