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Interesting
Hi all,
Thanks for your comments above. Last night, I decided to use the 40d instead of the 600d to see if it made a difference. The attached image is 25 X 90sec subs at iso 800, with 10 darks, 25 bias and 25 flats all taken during the same session. Looks like there is no CA, and the noise is a lot less. One thing that I did notice is that while the outside ambient temp was 11'c, the sensor temp on the 40d was +13'c according to byeos. The 600d's sensor temp the was at +25'c when the ambient was 13'c the night before. Thinking that it might be the camera..
Thanks
Andrew & Campbell
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