Quote:
Originally Posted by Bassnut
whoa, OK, the noise is starting to intrude there (1600iso).
Hang on, you saying both images have NO dark?.
No, thats impossible, you cant do 15mins with no dark (or cooling), fess up Chris, whats up?
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Nope - no darks at all Fred, and no cooling.
Ambient temp was about zero deg C. The ISO1600 version was very over-exposed after 15 minutes, given that while the sky was reasonably dark, it wasn't a Coonabarabran sky by any means. DPP flattened the highlights (most of the frame) and a gaussian blur in Photoshop reduced the noise somewhat. Rooly-trooly, scout's honour.
The 40D leaves the amps off until read-out, and thermal noise is minimal in this camera. Maybe lucky it's a good one?