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12-11-2009, 05:12 PM   #1
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Sigma 24-70mm f/2.8

How come I've never heard of anybody speaking of this lens?

12-11-2009, 05:28 PM   #2
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Interestingly, this is one of my question too. I was told that this lens is a high quality lens and is extremely sharp. I just could not find much user feedback though.
12-11-2009, 06:38 PM   #3
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you can include the Sigma 70/2.8 as well. not too much thread regarding that lens here except from jsherman's. I give him props though for convincing me to get one. I have no regrets. I can't say nothing bad against that lens. IQ-wise, it can give the DA70 and FA77 a run for their money.

reason why they aren't given much credit, I suppose because they are Sigma lenses.
12-11-2009, 10:06 PM   #4
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there are quite a few more about the sigma f2.8 24-60mm - it is a very nice lens itself, though now discontinued alot of buyers snatched them up last year when they were selling new just over $200 - can only be found in the marketplace and ebay now.

12-11-2009, 11:52 PM   #5
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QuoteOriginally posted by pxpaulx Quote
there are quite a few more about the sigma f2.8 24-60mm - it is a very nice lens itself, though now discontinued alot of buyers snatched them up last year when they were selling new just over $200 - can only be found in the marketplace and ebay now.
that's a great deal. a good and cheap alternative for the 16-50/2.8.
12-12-2009, 09:00 AM   #6
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There are now two versions of the Sigma 24-70 f2.8 lens in Pentax mount: the "old" Ex DG Macro version; and a new IF EX DG HSM version. The first one sells for $750 in Canada, the second costs a whopping $1200 (prices from Vistek). The "old" one is a lens I would love to have.
12-12-2009, 09:22 AM   #7
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So, why no love for it ?
12-12-2009, 09:44 AM   #8
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The old version had lots of flare issues and is somewhat mediocre for what it should be.
The new version beats Canon's L version of it and is competitive w/ Nikon's version on APS-C cameras (Nikon's is far better at the edges on FF).

12-12-2009, 12:38 PM   #9
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The Tamron 28-75 looms large in this space

Part of the reason might be the existence of the Tamron 28-75 2.8 - one of the sharpest zooms you can get for Pentax, and it can be had used for under $300.

That Sigma's a nice lens, but I know that if I got one, I'd just end up missing my 28-75's blistering sharpness.
12-12-2009, 12:57 PM   #10
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I'am also wondering why you don't hear/read a lot about this lens, I guess jsherman999 got a point about the competition against the Tamron 28-75 2.8.
The Sigma is heavier, bigger diameter 82mm (expensive, hard to get, filters) and the price is more expensive than the Tamron.
Maybe that are some reasons, why people choose a Tamron in stead of the Sigma.
12-12-2009, 02:30 PM   #11
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the only downside of the Tamron is it's slow and noisy AF speed, zoom creep, built and QC issues (centering defect). getting a lemon is the last thing that you would want. it is said that the Tammy is a monster on an APS-C dslr, but not as quite as great on a full-frame but still display an excellent center sharpness. although what confuses me is that the MTF results on a FF has an outstanding score as compared to the APS-C, but the APS-C verdict is a lot higher than the FF. I dont know how photozone arrive or use and interpret these MTF results, but it seems it is inconsistent or does not reflect on the final conclusion about the lens. could anyone explain how a lens with a 3000 MTF mark on a FF gets only a 2 and a half approval, while a 2000 MTF mark on an APS-C gets a 4 approval rating. maybe photozone mixed up the MTF results?
12-12-2009, 02:45 PM   #12
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My copy of the Sigma 24-70mm f/2.8 is a good lens. It's not a great lens, and the colors aren't fantastic, and it doesn't really stand out. It's not super easy to use, it's not super cheap, it's not a lot of things. It's heavy compared to primes (duh), it's not great with flare, filters are expensive and a pain at 82mm, and I hate the double switch to go from AF to MF, but I don't MF with it anyway because it's such a fast ratio I can't be very accurate with it except in tripod mounted 10X zoom-check-focus situations, and then I might as well have brought 2-3 primes.


It's a good zoom lens and I've made most of the money I've made with a camera with this lens on, but it holds no warm place in my heart. I'll keep it and continue using it for all-around stuff because I value the acceptable to very good IQ that I get from it along with the versatility of the wider end, though.
12-12-2009, 05:09 PM   #13
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QuoteOriginally posted by Pentaxor Quote
the only downside of the Tamron is it's slow and noisy AF speed, zoom creep, built and QC issues (centering defect). getting a lemon is the last thing that you would want.
I got 3 lemons in a row w/ the Tamron...BF/FF issues and in one case, 75mm was so fuzzy (no pixel peeping) it was useless...
12-12-2009, 07:08 PM   #14
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I have one and like it a lot. just a tad soft wide open, very sharp from f4 onwards. I'm a primes user, and have sold off all the zooms I had or passed through my hands. But this Sigma's a keeper for me, even though it doesn't see that much use due to competition with my primes. But when I do use it, it doesn't disappoint.

digital, wide open. 70mm


on B&W film. The softness is something I PP'ed in, not something from the lens.
12-13-2009, 11:20 AM   #15
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QuoteOriginally posted by netuser Quote
So, why no love for it ?
The obvious reason is that it's really a full frame lens. That makes it large, heavy and expensive compared to APS-C alternatives like the Pentax 16-50 and the Tamron 17-50.

I've seen some reports from CaNikon land which says this lens rivals the 1st party alternatives, so it's definitely a good lens.
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