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 Post subject: Sigma 80-200 f/3.5-4.0
PostPosted: Wed Apr 07, 2010 1:22 pm 
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Joined: Mon Jan 18, 2010 3:52 pm
Posts: 2177
Location: The Netherlands
Hi all
I own a sigma 80-200 F/3.5-4.0 and my question is: can I use this for astrophotography? Ill buy a minolta to eos adapter (it's an old one) and fit it with a 550d. (That's my plan, I dont have the 550d yet)

Could I make nice pictures with this? Since ISO6400 is almost useble, and a bright telelens.....?

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Ruben

Panasonic DMC-FZ18, Panasonic DMC-FZ28, Canon G5, Canon 350D, Canon 50D + BG-E2N
Tamron 17-50 2.8, Canon EF 70-200mm f/4L USM,
Canon 18-55 II plus lots of Minolta MD/M42 lenses and bodies


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 Post subject:
PostPosted: Wed Apr 07, 2010 4:47 pm 
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Joined: Sun May 25, 2008 12:48 pm
Posts: 8032
Location: UK
You can certainly use it for astrophotography, but the real question is how good is it...

Particularly if you're planning on using it at the longer focal lengths, you will run into motion problems unless you you keep a very short exposure. Maybe you can get away with as much as a few seconds without using a motorised mount.

Oh, and while ISO6400 might be usable, it doesn't mean it's great. Noise will still be significant at that setting.

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Lenses: EF 35/2, 50/1.8, 85/1.8, 135/2+SF, 28-80 V, 70-300L, 100-400L, TS-E 24/3.5L, MP-E 65, EF-S 15-85 IS
3rd party: Zeiss 2/50 makro, Samyang 8mm fisheye, Sigma 150 macro, 120-300 f/2.8 OS, Celestron 1325/13
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 Post subject:
PostPosted: Wed Apr 07, 2010 4:53 pm 
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Joined: Mon Jan 18, 2010 3:52 pm
Posts: 2177
Location: The Netherlands
I know about the noise, but Ill stack the pics. I hope that will give better pics.
Im planning to photograph Orion Nebula, which I now do with the FZ28 (panasonic).
I do it like this: ISO800, 25sec. exp and F/2.8
But, when zooming in (after stacking) I dont have enough pixels to get a good picture. So, Ive to zoom. Any tips?
Thanks for answering btw;)

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Ruben

Panasonic DMC-FZ18, Panasonic DMC-FZ28, Canon G5, Canon 350D, Canon 50D + BG-E2N
Tamron 17-50 2.8, Canon EF 70-200mm f/4L USM,
Canon 18-55 II plus lots of Minolta MD/M42 lenses and bodies


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