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SCT f/6.3 reducer question
Tonight I was going to use my Hirsch f/6.3 reducer for imaging with a c9.25".
I checked my collimation without the reducer and it was pretty much spot on. When I put the reducer on and checked it (with a 60d) the collimation was way out away from the center. The center of the collimation pattern was moved outwards from the center of the image.
I guess this means the image isn't flat at all - possibly over corrected?
Is it because the Hirsch reducer is crap or unsuitable or do I need to use spacers? From what I have read the Hirsch one is similar to the Meade reducer and the Antares is similar to the Celestron brand. Or are they all the same?
Any suggestions? What is the best reducer and set up with a C9.25 (standard). I usually image at f/10 - but that isn't easy.
Regards,
Tony.
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