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Bob
Do you already have the reducer? If so, try it. The meade comes with the T-SCT adaptor and a few spacers.
But if you have the 6.3 I'd definitely try that first. It uses much longer spacing than the 3.3, and will produce much less vignetting.
I don't have an SCT anymore so dont remember what spacing I used. And it also depends on what backfocus your camera has. If you are using a dslr it could be aproblem as they have a really long backfocus (I suppose).
I connect scope to reducer to t-SCT adaptor to spacer to camera. I took a shot with out the reducer, then with the reducer with no spacer, then kept increasing the spacer until the image was crap. Bang the images into astrometry.net and you can work out the reduction.
Just try what you got first. If no good, then try what the others have mentioned - they know a lot more than me.
Chris
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