I left the colour to show there was no CA. Here is a Moon image taken with a TAL200K at twilight last night.
Single shot 1/125th sec exposure ISO100. Canon 5DH, TAL200k with Hutech focal reducer so 1790mm At F9.
Both images full frame.
1.2MB
http://members.optusnet.com.au/~trlee8/TAL_MOON.jpg
Bert