I use a 450D and have found with these older models that good acquisition and proper image calibration is important. If you are particular in these areas, the rest just falls into place. Dithering between shots makes a huge difference to image quality as well.
Dark frames can be a blessing and a curse. Dithering helps. If you use darks in PI take longer darks than lights and use the scaling function. That way you work around the problematic dark / light mismatch.
If you include darks in your workflow without scaling, it's better not to subtract the bias from the darks and lights. Just subtract the master dark from the lights and use a master bias to calibrate the flats.
This is my view of the world. No doubt others may see things differently.
EDIT: In some cases median combining bias darks and flats improves results by reducing random noise in the calibration frames.
Last edited by rcheshire; 05-06-2018 at 08:32 AM.
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