Master Bias

[SAW]

Hi,

I have been creating some master bias frames from my modded 600D at ISO200, 400, 800 and 1600. I am using the image integration tool with 50 frames for each ISO and following the settings suggested in 'Inside PixInsight' I'm suing Linear Fit Clipping for the rejection method.

When I stretch a single image compared to a stacked one I don't see much difference, there is what seems to be less random pixels in the stacked version and looks like there is a bit of banding in the stacked one.

Is this normal or should I use different settings ?

Thanks.

[GregW]

I think that they should look all similar as Subs or stacked, except for the accumulated banding that you see I believe that is why you take a bias so those could be subtracted out of your images. Sounds like you're doing it right but I would take 50 more of each, for 100, after all you only have to do it once. Many people here say not to even use a bias, but until I figure out where to use my dark Flats I have been using bias and works very well.

I have a modified T3i as well The Sweet Spot for the camera seems to be ISO 1600.  if you don't want to do them all at least do that one up to a hundred.