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08-08-2010, 11:09 AM   #1
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Which zoom is sharpest wide open, on the long end?

I am thinking of adding an auto focus zoom. f2.8.

Probably going to rent one during the Christmas season to shoot one of our productions.

Looking for suggestions...

Tamron 70-200 f/2.8 Di LD Macro

Sigma 70-200mm f/2.8 II EX APO Macro HSM

Pentax 50-135mm f/2.8 ED (IF) SDM smcP-DA

Which should I try? Am I missing one? K10D. Looking for something to shoot concert type events. Indoor, low light. Which is sharpest wide open at the max zoom?


Last edited by mediaslinky; 08-08-2010 at 11:52 AM.
08-08-2010, 01:09 PM   #2
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I didn't really get if you are looking for advice only for renting or renting and later buying, but here goes:

I'm having the same problem...
The Tamron is opticaly great but it has no in-lens motor - slow and noisy. Buying it used is a risk - sticky aperture.
The Sigma has the HSM but it's not sharp at 2.8, not the latest version at least. And the first versions are impossible to find
The Pentax is my choice - WR, SDM, lightweight, small and it's a Pentax. I know it's shorter and the SDM could fail, but I've used the ones my friends have and it's perfect, I love it and can't wait to get one. I'm selling everything in my home I don't use often to finance the purchase
It's also the most expensive.

If I don't get the 50-135, it'll probably be the Tamron, because the image quality is more important to me than HSM, I don't shoot sports anyway. The lack of Tammy's motor isn't so bad, but if I'm buying a 2.8 premium zoom, that's what I want it to be - premium.

Hope this helps
08-08-2010, 04:46 PM   #3
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Original Poster
Thanks. It does.

Looks the Pentax is the way to go.
08-08-2010, 06:11 PM   #4
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Shooting subjects at a generally fixed distance (concerts) makes a slow and noisy AF less of an issue.

Focal length might be of more importance.

08-11-2010, 03:43 PM   #5
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For smaller venues, the 50-135 would be the more useful focal length range. For larger venues, the 70-200 might come in handy - but then, you can always crop pictures taken at 135mm.

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