Canon 600D versus the rest

[JonH]

Well it looks like the frames i took for the 450D are giving slightly more reasonable results this time, which ones did you use in the end?

[RobertM]

Just checking - have you have been scaling just dark current noise rather than the sum of dark and read ?

Robert

[MarkS]

Both the read noise and thermal (dark current) noise have to be scaled.  But they have to be scaled in the right way - not in the way I did it above.

[MarkS]

Mac (and anyone else interested),

I've put instructions for calculating gain, read noise and dark current here:
http://www.markshelley.co.uk/Astronomy/technical/Calculating%20Gain%20Read%20Noise%20and%20Dark%20Current.doc
They refer to a spreadsheet that does all the difficult calculations.  It can be found here:
http://www.markshelley.co.uk/Astronomy/technical/Gain_ReadNoise_DarkCurrent.xls

Comments and criticisms welcome!

JonH (and anyone else interested),

You might be interested in this presentation I gave at the O.A.S. some time ago:
http://www.markshelley.co.uk/Astronomy/technical/Noise.ppt

[JonH]

Thanks Mark, wish i could have been at the presentation, but the powerpoint was till pretty informative!

[Mac]

All three downloaded, Ta.
At some point over the new few weeks,
i'll have a go and get out and try some of these measurements and post the results.

Mac.