I've just ordered a GSO SCT 10:1 focuser for my C8. So, I cannot comment on how good it is but from what I have read on the internet & this site...they are OK.
I gave up with the stock focuser when trying to image Jupiter with a 2X barlow at prime focus with a SPC90NC web cam. I tried every trick to reduce this image shift.
The image would pretty much shift 1/4 of the CCD FOV (which is actually a pretty small FOV in anycase) when trying to focus. All very frustrating.
And...I'm too poor for mega cost addons.
