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Old Jun 3, 2006, 11:18 AM   #1
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Didn't see an astro thread so hope it's welcome here...

30sec exposure at 17mm, ISO 3200

about 10 seconds into the exposure, an airplane came into view and sailed right thru the big dipper! I only wish I would have tried this at ISO1600. It's a tough call when it's pitch dark & you can't set an exposure past 30 seconds with the 20D (very LAME!)
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Old Jun 3, 2006, 12:00 PM   #2
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Nice shot. A longer exposure would have put the airplane past the dipper – it is probably better the way it is. You can do about as well in Photoshop as increasing the ISO. You end up with about the same noise though.
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Old Jun 3, 2006, 5:16 PM   #3
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for this specific shot, you're right....for astrophotography in general, 30 seconds really limits you. My friend has a 10" meade scope and we would be able to capture so much more in the way of nebulas, planets, etc with longer exposures, for sure.

To be sure, the 20D-A (optimized for astrophotography) is running for about twice the standard model! :?
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Old Jun 4, 2006, 1:08 AM   #4
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As far as I know, the 20D has Bulb exposure, so with a remote [very cheap], one can expose as long as you like. Nice shot as is !!
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Old Jun 4, 2006, 9:09 AM   #5
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Old Jun 4, 2006, 1:54 PM   #6
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thanks for the tip on bulb exposure! duh!
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Old Jun 4, 2006, 2:39 PM   #7
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do you need a remote though for a longer exsposure than 30 secs?
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Old Jun 4, 2006, 3:59 PM   #8
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well from what i have read.. you have to manually hold down the shutter realease in bulb which can cause a lot of unwanted shake... so a remote is highly recommended... if i'm wrong (which i very well could be) someone please correct me...

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