Hello, I recently purchased a used Celestron SCT 6.3 Reducer/Corrector. I have experienced a problem with it and am seeking advice. When I put it on my scope I am experiencing that my telescope becomes (quite a bit) of out of collimation. Is this common? Is this a bad corrector? And if so can it be fixed? I'm guessing viewing and/or photography will be effected. What are your thoughts?
SCT Reducer/Corrector question
Started by 2dogs7, 05/01/2015 06:14PM
Posted 05/01/2015 06:14PM
Opening Post
Posted 05/02/2015 01:38AM
#1
That sure seems terribly suspicious, but I've had no direct experience. Would think all the tolerances would be self-aligning provided the scope itself is good. What is the signature of the poor alignment? (I have equivalent Meade-to-Meade f/6.3 "Reducer/Flattener" and had no such problems). Someone with your same setup may shed light on this. Tom Dey
29-inch Dob in a dome
36-inch upgrade soon
LUNT 80/80 solar scope
FLI 6803 cam
APM 100mm APO Binos
JMI RB-16 Night Vision Binos
Zeiss 20x60 IS binos
Posted 05/03/2015 03:34AM
#2
I have almost certainly eliminated the corrector as the problem. I tried it on another scope and it checked out fine (no change whatsoever in the star test pattern). Same result while rotating the reducer. I believe that my problem is with my main tube. I think that the optics might be "tilted" (not concentric with the tube/not perpendicular to the threaded rear attachment/rear of the scope). I plan on verifying that the center (visual) tube is concentric with the outside walls. Then when verified/fixed I will check that the primary mirror is perpendicular to the center and outside tubes. When that is completed I will need to install the corrector plate parallel to the axis of the primary mirror. Then I can collimate the secondary. Anyone see any problem with this logic? Thanks
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