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02-22-2011, 12:14 PM   #1
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DA* 16-50 f/2.8 vs Sigma 24-70 f/2.8 HSM

I am curious wich of these lenses would be more useful and have better image quality. They are roughly the same price and both have a sonic focusing system.

My big question is which would be better for a paid event photographer? The SDM failures on the DA* line turn me away from that, while the Sigma doesn't quite have the optical quality of the DA* from what I understand. I love the idea of weather sealing paired with my K5, but the Sigma's focal range seems more useful.

Opinions, thoughts or comments?



Please don't argue about whether SDM has been fixed or not, in my view it hasn't, and I'm pretty sick of reading threads that morph into the debate of whether it is fixed or not, completely ignoring the OP's actual question. Thanks!

02-22-2011, 12:22 PM   #2
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For event photography, AF performance would be the priority imho. I have my own pick but none for the Pentax. No SDM bashing this time.
02-22-2011, 12:27 PM   #3
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Yeah, I know Canon and Nikon seem to have the "Pro-Standard" lenses covered (24-70 f/2.8 and 70-200 f/2.8). I'm really not sure why Pentax wouldn't move towards these now though. Their focal lengths for lenses seem to be a little odd with the DA* line IMO, but I also know they work great for some people.

Out of curiosity, what is your pick? 24-70 f/2.8L?
02-22-2011, 12:35 PM   #4
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The reputation of the 24-70L is not that great as the QC on built quality and optical misalignment are rather spotty. The EF-S17-55/2.8 would be it but then it's not FF and wasn't built to be abused.

The problem with Pentax AF is not just speed that SDM lacks, but the AF system as a whole. Even if the lens can be lightning fast, the bodies aren't intelligent enough to drive them well in difficult situations. For one none of the Pentax DSLRs has predictive AF tracking yet. If you will be a paid event photographer, you might get the real deal and make some good money instead of hoping for something that Pentax is not.

02-22-2011, 12:44 PM   #5
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QuoteOriginally posted by soppy Quote
Yeah, I know Canon and Nikon seem to have the "Pro-Standard" lenses covered (24-70 f/2.8 and 70-200 f/2.8). I'm really not sure why Pentax wouldn't move towards these now though. Their focal lengths for lenses seem to be a little odd with the DA* line IMO, but I also know they work great for some people.
The DA* focal lengths of 16-50 and 50-135 basically gives you the same FOV as the 24-70 and 70-200 on a FF body.
02-22-2011, 12:53 PM   #6
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QuoteOriginally posted by wlachan Quote
The problem with Pentax AF is not just speed that SDM lacks, but the AF system as a whole. Even if the lens can be lightning fast, the bodies aren't intelligent enough to drive them well in difficult situations. For one none of the Pentax DSLRs has predictive AF tracking yet.
Have you ever tried the K-5?
02-22-2011, 12:56 PM   #7
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Soppy, to me it would come down to a few questions:

1. Focal length - Do I need more on the wide end, or more on the tele end?
2. AF speed - Is this fast action sports? Or concerts? The HSM of the sigma would be slightly faster than the DA* (af speed on that lens isn't exactly the fastest)
3. WR - What will the conditions be like?

After answering these three questions I bet you'd have a pretty good feel for which is more for you...

Hope that helps!
02-22-2011, 01:26 PM   #8
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DA* 16-50mm/2.8 would be the better choice. You got all the negativities in your head about SDM, maybe should switching a brand, nothing is perfect... As long as manufactures back up their products, you will be fine with DA*....

02-22-2011, 01:31 PM   #9
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I shot several events with 24-something zoom and often found it not wide enough on cropped camera. With K-5 resolution you can easily crop the image to get the 70mm but not vice versa. Unless you have chance to get the Sigma really cheap, get the wider option.
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