NGC 5139 (first attempt)

First chance I've had to shoot this ... it's just popping up over my roof at the moment.

19min 30sec of light subs, no darks or flats.

Realised afterwards, as I aimed at Saturn, that focus was out a little bit. Whoops, should have used my b-mask. Keen to get feedback, comments or complaints?

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Got some coma at the edges but other than that very nice . What equipment , scope did you use ??

Well done. It must be something about that glob. I can never get a decently focused image of it, either.
I agree with Ron. A field flattener could be on your Christmas list. Or a cheaper option is to crop it a bit and remove the worst offenders.
Good to see that your out there using it.

Coma? No, no ... Isn't it because the universe is expanding? Which is also why it's difficult to focus, haha. Thanks for the comments and feedback, will look into the field flattener. Using the Orion ed 80t cf on a heq5 Mount.

legoman_iac wrote in post #15983613
Coma? No, no ... Isn't it because the universe is expanding? Which is also why it's difficult to focus, haha. Thanks for the comments and feedback, will look into the field flattener. Using the Orion ed 80t cf on a heq5 Mount.

Nope , it's coma alright . Look on the left side of the image . Universe will never expand fast enough to capture coma . Focus isn't that much of a problem here .