M33 - The Pinwheel, Triangulum

[Graeme Coates]

Had a good run of clear weather towards the end of Nov around New Moon
(3 work nights on the bounce, argh!) and managed to grab a fair bit of
data, which I'm trying now to finish processing.

The main image I worked on was M33, as attached. Image consists:

L:R:G:B
310 (31x10, unbinned):95:90:80 (all 5min subs, 2x2bin)
9h35m total

All taken with ST2k, WO FLT110 at f5.7, on the Titan - all self guided
by the 2nd guider chip.
Images reduced combined and processed in Pixinsight, followed by final
processing/touch ups in PS.

Processing this isn't easy and I'd had a couple of goes at this
already, but this is the best version I've got here. it not helped by
it pretty much filling the frame, so removing colour casts was a bit
of a pain and resorted to manual gradients/lasso in photoshop (I note
that using a tablet/stylus is so much easier here!). I had to pull the
black point up somewhat compared to the automatic background set point
in PI - but still the casts were tricky to completely kill off...

I have 2 hrs of HA on this as well, but I need flats, and I need a
break from this ;-)

This is the 75% size version to save a little bit of size (and looks a
little better IMHO)

Cheers

Graeme