Yes they sure do.
Thanks Paul. I used good old ISO 200, starting out with a 5 min shot but after trying 10 minute shots I continued with those as the filter darkens the sky somewhat. I did flat fielding but obviously that cant remove the reflection. I must try the mask idia. If I was keen Id remove the corrector plate and take it down to Chi Qin Co for an antireflection coating, but my budget allows for just the 10 inch recoat. Initialy I was just using the 6 inch while the 10 inch was down but I might keep using it fairly often even when the 10 inch mirror is back. One night I might try out my 400mm F3.6 lens too.
Ive rotated the Horse 180 degrees now
http://www.users.on.net/~josiah/mod3...lteredmmed.jpg
Scott