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G'day mate..
Despite what you said in your first post, You have nothing to worry about here mate! Given that you're imaging at F/10 with tiny pixels, that image is utterly superb... Its come up beautifully!
A DDP filter is a filter used to brighten an image without changing the look of the high range (Bright) areas of the image, this includes stars... DDP filtering an image like this would help keep the stellar profiles as small as possible. Using a deconvolution filter would also help out a lot on this image considering how heavily oversampled it is... It would sharpen the detail, reduce the sizes of stars and help mask any elongation due to curvature or slight tracking problems
Both DDP and Deconvolution are filters that are most common in astroimaging software.. I think Photoshop has a DDP filter, but not deconvolution...
For a first attempt at imaging with a 2000mm FL, you've done an outstanding job and should be very proud of the image..
Alex.
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