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Hi Rowena , I use the Celestron F6.3 reducer on my C11 and C8
it works well with one small problem you will find with 35mm film that you will get some vignetting, this is when the corners of the frame don't get enough light, but it's not a problem you just crop the image. I bought mine from OS cost about $169.00 .
Another hint to get a good polar alignment start with a compass , I have the compass on a length of wood so it's about 1m away from the mount, as long as you have the deviation set right on the compass you should be able to get very close to the pole within 1degree at least.It's simple to do just find a flat spot on your mount and then place the wood against it and move the whole mount till the compass arrows point north or south whichever you use.
When you get this far you then use your polar finder if you have one or do a drift alignment.
regards
David
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