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02-10-2010, 08:50 PM   #1
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I assume this is a self answering question.

I took this photo at 200 ISO F/8 w/30 sec exposure with my 50mm Asahi Pentax lens. I also used the 12 second timer, hoping that any shakes from me letting go of the button............... I still got movement I guess you would call it, and when I tried to photo Venus the same way with my Phoenix 500mm, forget about it.......what can I try? Weighting down the tripod? any other thoughts

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02-10-2010, 08:57 PM   #2
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Well, Other than the 30 rotation of the earth with respect to the sky, I'm not seeing any movement. Can't tell in the photo you show. Or is that the movement you are talking about? Weighing down the tripod helps but what exactly are your expectations?

02-10-2010, 09:09 PM   #3
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here it is zoomed in a little, which is not as bad as the movement with the 500mm / venus picture.
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02-10-2010, 09:11 PM   #4
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The earth rotates; the stars move. Not much you can do about it.


Except, why the hell did you shoot @ F8 when you have, presumably at least F2 or maybe even F1.4??


Shoot wide open, that's what they're there for.


With a 50mm lens on FF, the rule of thumb was 15s is the longest you can expose with minimal star trails. On APS-C, I'd cut it down to 10s.

Even then, if you shoot wide open, you should get many more stars in the shot with minimal trails.

02-10-2010, 11:10 PM   #5
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AH......F/2, much better
02-11-2010, 03:12 AM   #6
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Also, use the 2 sec. self timer. With the 12 sec. timer, the mirror will flip only at the moment of exposure, thus causing camera shake. With the 2 sec exposure, the mirror flips when you press the button, and the shutter trips 2 sec. later, avoiding camera shake.
02-11-2010, 04:41 AM   #7
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(Telescope tripod) + (Equatorial mount) + (Tracking mechanism that matches Earth's rotation) --> no star trails. Easy as Pi. I bought such with scope and COMPUTER CONTROLS at a yard sale for US$50 a few months ago. I might even use it some day.
02-11-2010, 09:29 AM   #8
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Wow that is a lucky find. Now I need to learn how to photoshop out the light pollution

02-11-2010, 04:13 PM   #9
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QuoteOriginally posted by MikesChevelle Quote
Wow that is a lucky find.
It's a cheap scope.

QuoteQuote:
Now I need to learn how to photoshop out the light pollution
Increase contrast, darken, repeat till inky.
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