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09-09-2012, 02:07 PM   #1
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best 18-50-ish standard zoom under $500 used

I'm sure this has been covered before, but I need up-to-date info. What is the consensus on top standard zooms for the Pentax K-5? I have been very disappointed with the SMC 18-55 AL and WR. I need a very sharp standard zoom that I can get used or new for under $500. I don't care what brand it is, though it must autofocus on my camera. Thanks!

09-09-2012, 02:10 PM   #2
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Did you look in the lens reviews section?
09-09-2012, 02:41 PM   #4
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Easy, Tamron 17-50mm. Under $500 new.

09-09-2012, 03:01 PM   #5
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QuoteOriginally posted by Sol Invictus Quote
Easy, Tamron 17-50mm. Under $500 new.
Sigma 58C109 17-50mm F2.8 EX DC OS HSM Lens at Amazon is $619. A Google Shopping search on "Sigma 17-50 Pentax" turned up none under $600.
09-09-2012, 03:23 PM   #6
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Don't overlook the F24-50

SMC Pentax-F 24-50mm F4 Reviews - F Zoom Lenses - Pentax Lens Reviews & Lens Database 9.20
09-09-2012, 04:37 PM   #7
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Sigma's 17-70 should not be overlooked, most certainly note the older f/2.8-4.5 version. Very close focusing, a nice range of focal lengths, and decently fast apertures. The newer one is a smidge faster at 60mm+ and would focus more quietly, but owners of the elder model seem happier overall. Even the DA17-70 is well liked but has its detractors.
09-09-2012, 04:40 PM   #8
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A simple answer for this one. Tamron 17-50 F2.8.

09-09-2012, 06:14 PM   #9
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I agree with Tamron 17-50 F2.8 too.
09-09-2012, 08:03 PM   #10
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I have a sigma 24-60 2.8 EX and its a stellar lens. It was discontinued and replaced by the 17-70. I reviewed lenses in this range for weeks before purchasing and found the 24-60 sigma outperformed the wider range 17-70, which is to be expected.. but you have to pixel peep. The tamron 17-50 is a very nice lens as well and it came down to price. I got the sigma 24-60 for under 300 and though they're harder to find worth every penny and more. It's right on par with the 17-50 tammy if you ask me but the ticket price is much lower. You sacrifice a little range for higher IQ IMO. Lens is built solid. From images I've seen you cant go wrong with the tamron 17-50 either.

good luck on your research.
09-09-2012, 08:04 PM   #11

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One of these lenses that others have mentioned:

Tamron 17-50/2.8
Tamron 28-75/2.8

Notice they all have a constant aperture - that's important for ease of use, and is nearly always a sign of better quality.
09-09-2012, 08:36 PM   #12
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I got my Sigma 18-50 F2.8-4.5 DC OS HSM for $150 on Ebay, It was a huge bump up from the kit lens, for about the same price of the kit. It doesn't retain F2.8 throughout the zoom range like the more expensive models, but I always had crisp, bright images come from this lens. If you're on a budget this is a GREAT deal.
09-10-2012, 05:16 AM   #13
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+1 on the Tamron. Mine was only about $300 new:

Tamron SP AF17-50mm F/2.8 XR Di II LD Aspherical [IF] (A16) - Lens ?? - ???? - ?????
09-10-2012, 01:41 PM - 1 Like   #14
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I think the sharpest of the bunch is the older pre-HSM and pre-Macro Sigma 18-50/2.8 - which you may find well below 500USD used. I started using my copy again as my DA 16-50 just starts to fall apart for the second time. I don't think I send the DA in for repair again, it seems to be just poorly constructed, which makes the Siggy even more attractive.

09-10-2012, 05:09 PM   #15
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I also have the Tamron 17-50. Pretty solid lens. Some copies front- or back-focus a little bit so just be sure to check focus accuracy and use he AF fine adjustment on the K-5 if needed. You can set an adjustment for individual lenses. Used ones go for around $350.

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