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Like David, I added a Moonlight focuser to my scope. I found that with a large chip ie QHY8 or Canon 20D there was no need for field flatteners as it has a remarkably flat field. Also no (in my scope) CA in photos or visual. You may get a little coulour around bright stars optically and visually on a night of bad seeing due to atmospheric aberations. I find that using a Bahtinov mask for focusing, nails that aspect so tightly, that once I have clamped the focus on the Moonlight focuser its perfect.
If you buy this scope - get a Moonlight focuser. Not only will it enhance the scope to a top end instrument but the people there are great with their service.
Can't recommend my scope too highly, but Im basing my bias on this scope only - there may be variation in other samples. I raise this caveat as my scope has hand selected japanese optics/glass from the factory through the distributor.
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