Ngc 3372

[solissydney (Ken)]

My first image using my Williams 72 mm Megrez shows some very bad coma.
The Carina Neb. single exposure 60 sec @ ISO 1000 using my Canon 5D
My question, do I need a coma corrector, and will that solve the promlem of coma?
Ken

[multiweb (Marc)]

Not bad at all on axis. You will need a field flattener, not a coma corrector. The 5D has a big chip.

[solissydney (Ken)]

Thank you Marc for the information I shall now search for such one.
Ken