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11-14-2010, 04:06 AM   #1
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Sigma 17-50 f/2.8 instead of kit lens for K-5?

Hey all--thinking of returning to Pentax and buying a K-5. Has anyone tried the new Sigma 17-50mm F/2.8? Compared it to the Tamron and/or WR kit lens? I'd love to have that constant aperture. But I'm curious about AF speed on the K-5.

11-14-2010, 06:35 AM   #2
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Mabelsound, I don't have the 17-50 or the K-5. I have the K-7 and my walk around lens is the Sigma 17-70 2.8-4.5. The AF speed on the K-7 is very respectable unless your in AF constant and from what I've read the AF in the K-5 takes that to a great new level. I love the extra reach of the 17-70 and frankly don't need the extra stop when I zoom all that often. I also have the Pentax kit lens. It's not bad.
I have decent glass in my kit and ironically my cheapest glass is also my only water resistant glass. That's the reason I bought the 18-55 and am glad I did. It's nice to be able to not worry about the weather. That's something you will have with either the K-7 or K-5.
If you are willing to spend a little more money on a lens, the Pentax 16-50 is an incredible addition to your kit and it's water resistant as well. It's built like a tank and from what I've read should last a lifetime. I hope to eventually get one.
11-14-2010, 09:48 AM   #3
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I went with the DA 16-45 f/4 and have no regrets. I know many people get goosebumps about f/2.8 lenses but I'm not one of them; I'm sure it's a good lens (my Sigma was the same 17-70 PentaxRev owns & likes). With the K-5 the f/2.8 seems even less important for light gathering, though for deeply OOF zones I'm sure it is great. The 16-45 is available commonly and fairly cheaply in the marketplace on this site.

Nearly any good lens hooked to a K-5 is a good choice now, it seems!
11-14-2010, 12:27 PM   #4
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Thanks, guys. I am thinking about just getting the K-5 and 31mm Limited (should never have sold my last copy, it's much pricier now) and slowly filling in the gaps with primes. But it might be nice to have a solid kit lens as I do this.

Anyone who actually owns and uses the Sigma, I would love to hear from you.

11-14-2010, 04:18 PM   #5
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I have the Sigma 17-50/2.8 and I've put my thoughts in this thread:

If you don't NEED the WR of the kit lens or the DA*, then I reckon it's a lens you should definitely check out. It is more expensive than the Tamron 17-50/2.8, but for me the extra for HSM is definitely worth it.

Last edited by pop4; 11-14-2010 at 05:51 PM.
11-14-2010, 04:42 PM   #6
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Excellent, thank you! I missed that mini-review.
11-14-2010, 05:06 PM   #7
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I tried the Sigma, but ended up buying the Tamron version instead. I couldn't tell the difference between the output from it and the Sigma on my lowly *ist D. AF speed seemed comparable when I tried them both.

I think there are rebates on the Tamron so that might be even cheaper right now.
11-14-2010, 05:08 PM   #8
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Oh, forgot to mention, I only have experience with the older non-hsm version.


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