460EX columns on BIAS

[shiner]

Hi, My BIAS images taken with 460EX (brand new) with Artemis capture with minimum exposure 0.001s shown these columns.  These make BIAS unusable with this camera.
Any comments on this please?  I am not the only one with this issue it appears from forums I participate in.
Steve

[chrisjbaileyuk]

Actually looks pretty clean to me! Why do you say it makes them unusable?

That is a very stretched picture and the actual pixel ADU values are very low. Every camera I own shows similar patterns, thats why you take Bias frames. Your light frames will have similar low level patterns so subtracting the bias removes them from the lights.

You need to stack a load of bias frames together to make a master bias, that will look cleaner still but still have the vertical pattern. How many you stack is up to you. I do 100!

[MikeM]

I agree with Chris - it looks pretty normal to me.

[Konihlav]

you need to turn cooling ON :-) the bias looks normal otherwise...