Fahim I think much of the secret to Erics, Pauls and Scotts images are their wonderful processing skills. Yes there equipment may be imaging at 1 arcsec resolutions, but that doesn't mean they are actually achieving 1 arcsec resolution as their results.
While I'm generally only using the ED80, either native or with the WO 0.8 FR, I have a 0.5X NextGen FR and Flattener coming for my 8" SCT which I am really looking forward to trying out. This will give me an 1.52 arcsec/pixel resolution which I think will be about as low as I can go with my atmospheric conditions on good nights.
I'm not sure how to go about binning a DSLR in PS.
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Originally Posted by Alchemy
would stacking say 20 pictures then using things like unsharp give you the extra detail similar to webcam imaging. only for deep sky.
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I don't believe so. If the detail/resolution isn't there in the first place no amount of unsharp masking will bring it out. You may achieve better results using a deconvolution algorithm like Lucy-Richardson or Maximum Entropy to improve resolution