Quote:
Originally Posted by strongmanmike
And that's about it Ray...being able to do without flats is simply a function of ones system ie a fully illuminated field, a chip with low NU, clean correctly sized filters, wide image train openings to avoid vignetting, a dark sky and.. voila 
I am able to surface extremely faint features without flats and I have not seen a single dust donnut, not one, even with extreme stretching 
Mike |
Apart from dust bunnies I found flats on some faint galaxies seemed to make some images more noisy I had taken with 694/CDK17.
But I did not have 16 or so flats median combined either so perhaps that is worth pursuing before its a fact.
Dust bunnies require either a clean or flats. Such a small chip is a long way from being vignetted on that setup. Other scopes may vary. My 16803 totally needs flats on the same scope.
Greg.