View Single Post
Old 28-09-2013, 01:14 PM
RickS's Avatar
RickS (Rick)
PI cult recruiter

RickS is offline
Join Date: Apr 2010
Location: Brisbane
Posts: 10,584
Nicely explained, Dave!

I was poking around my narrowband Helix data today and noticed that some of the faintest nebulosity that I'm able to see clearly in the stacked images corresponds to only 25e- in a 30 minute exposure. When you compare that to the 40e- bias drift I have seen from the camera I think it makes a convincing case for overscan calibration, especially when working with dim targets.

Reply With Quote