Thanks for the clarification, Daniel.


Quote Originally Posted by Daniel Browning
Unfortunately, none of the popular raw converters support dark frame or bias frame subtraction, so I tend to just recommend the long-exp NR.

Iris does it I think, and it supports 5DII raws.


Quote Originally Posted by Daniel Browning
One is the same as Canon (dark frame subtraction), and can be turned off. The other is an algorithm that looks for hot pixels, and cannot be disabled. This is of course bothersome for astrophotographers, since stars tend to look a lot like hot pixels. There is a cumbersome workaround, though: if you *enable* long exp NR, then turn off the camera in the middle of its dark frame, it will cancel the dark frame subtraction, cancel the hot pixel killing software, but still save the light frame.

That absolutely sucks, and is a deal breaker for me since I like to take multiple exposures with a timer. Glad I decided to pull my 5DII out of the trash []