Quote:
Originally Posted by gregbradley
Great Ha shots Ross. Adding to these with O111 and S11 so you can do narrowband images would be the go.
A slight amount of coma in the corners. Either spacing of your reducer is off or you need a flattener. Usually a reducer and flattener are 2 different things. Reducers sometimes will give elongated stars in the corners if their corrected circle is too small or the spacing is wrong and flatteners should give round stars to the corners with the correct spacing.
Greg.
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Hi Greg,
Thanks, I'm glad you like the photos.
I think I had better learn how to do RGB colour before I even attempt narrowband colour....a lot of reading to do over the next few rainy days!
The Eta C and Rosette photos were shot without the focal reducer/flattener. The Horse Head was shot with it, but I still have to get the spacing right with the QHY9.
Thanks again.
Ross.