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 Post subject: A200 at night?
PostPosted: Sat Apr 05, 2008 3:37 am 
I realize that Sony A200 did not perform quite as well as some other entry DSLRs (mainly the 400D/XTi) in the area of higher level ISO shooting. Does this put the A200's star/night photography well below that of the 400D, or are they fairly similar?

I haven't yet seen any night sky photography from the A200, so if anyone has any, by all means post it, haha.


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 Post subject:
PostPosted: Sat Apr 05, 2008 3:38 am 
Also, I was wondering what would happen if you set the ISO to say, 400 or 800 and extended the shutter time. Would this produce the same effect as a higher ISO with shorter shutter time?


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 Post subject:
PostPosted: Sat Apr 05, 2008 11:17 am 
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As far as astrophotograpy goes, you might even want to put ISO on 100 and increase shutter time even more. Stars are, after all, relatively static subjects.

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 Post subject:
PostPosted: Sat Apr 05, 2008 11:32 am 
If you consider the maximum acceptable ISO on the A200 to be one stop lower(IF) than the 400d(ISO400 vs 800) that would mean that the 400d can gather double the light, all other things being equal, without a drop in quality. I suppose it depends on how much noise you consider to be ok in your shots.

You could always lower the ISO and increase the length of the exposure, but from my limited experience in astrophotography, stars move during the exposure although not by much. How obvious the movement is, is dependent on your focal length and shutter speed.

Unless you have one of the awesome motorised mounts that Bob has! :D


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 Post subject:
PostPosted: Sat Apr 05, 2008 10:25 pm 
Okay, I think I am starting to understand some of this stuff, haha.

Thanks


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