Quote:
Originally Posted by gregbradley
Interesting image.
It really isn't the chip that determines whether or not you do flats - it is more the scope. But yes more of a problem with a larger chip which is more likely to cause vignetting which flats correct as well as any uneveness in the CCD's sensitivity. And yes a dirtier glass covering will require flats to get rid of the dust donuts. It is better practice as you mention to have everything clean as possible.
An FSQ 106ED does need flats especially with a larger chip camera. You can see some brightness drop off on the right side. Flats would have balanced the brightness out.
Cheers,
Greg.
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Greg,thanks mate I didn't even notice this till you pointed It out ! but It is due to some careless post processing.