Quote:
Originally Posted by astro_south
Michael, I have taken plenty of long exposures with the 50D and not seem any hint of banding. I think RB's suggestion of saving to the compact flash would be the best.
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Yep, I will give that a go and see what I get.
Quote:
Originally Posted by astro_south
If you are getting noisy terrestrial images (with iso 1600 or above) perhaps try over exposing a 1/3 to 2/3 of a stop. A lot of "noisy" images just aren't correctly exposed - tending to be underexposed.
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Thanks, I'll keep that one in mind for next time.
Quote:
Originally Posted by Octane
Also, for astrophotography, try using a AC-DC power source, rather than the battery. See if that makes a difference.
For all my astrophotography, ever since I began, I used a power source, instead of battery, and have never noticed a single band. If they did occur, it was my own fault for not taking correct flat lights.
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That is the difference between my 350D and 50D, I'm using an AC power source for the 350D and a battery for the 50D. Could it be possible that using a battery can mess around with a long exposure?
Quote:
Originally Posted by RB
BTW Michael, does the band show up in darks
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Andrew, I've just taken a dark, around 20 degrees C, 300 sec, ISO800. I pushed the levels way up high so you can see what is going on.