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Emu for review
After lurking on this list for ages I figure that it is about time I put something out there for review and feedback. Attached is a processed image of the Emu dark constellation. I would appreciate a critical review and advice as to what further processing may benefit (colour, contrast, detail etc) or anything that I should change in the approach.
Details are:
Canon 550D (unmodified)
20mm F1.8 USM lens @ F5
Ten subs ISO800 @ 6 minutes each
6 x dark frames
6 x bias frames
No flats (couldn't get them to work - for further discussion)
Mount = Losmandy GM8
Guiding = Synguider
Image plus for calibration, aligning and stacking
Photoshop curves adjustment for initial stretch and contrast enhancement
Some colour tweaking in levels and curves
There is some gradient present from sky glow even though I was imaging from a reasonable dark site. I tried removing these with Gradient Xterminator but was not happy with the result so left it as is.
I took some flat field frames with my 20mm lens but when I included these in the processing it introduced vignetting (odd, yes I know). This is a matter for further investigation. Anyway, I have learnt a lot about ImagePlus in the process. I found out, for example, that it was necessary to set the 'Short FL - Small stars' option in the align/combine menu due to the 20mm wide field lens.
As indicated, I would appreciate any feedback that can assist with improving the these images.
Rodney W.
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