Sigma Tamron
Tamron, Sigma or Pentax lens for my Pentax K20D?
I have a Pentax K20D and I’m not real happy with the sharpness of my current lens – the one that came with the camera. I want to get a new one and I’m not sure if I should look for a better Pentax lens or if I should go with Sigma or Tamron (which one?)…
Hi smky_mtn_cutie,
There are good choices in all three of those brands. I have lenses of all three and like them all. I do wish Tamron and Sigma didn’t make their zoom rings as stiff as they do, but it isn’t a deal killer.
Before looking for a better lens, though, it might be worth checking whether your current lens and/or camera have an autofocusing problem. I’d suggest printout out this autofocus test chart to see if you are currently getting correct autofocus:
http://regex.info/blog/photo-tech/focus-chart
If you are currently getting correct autofocus:
For the most bang for buck, I’d look at the Tamron 17-50mm f/2.8. However, there seem to be a high percentage of bad copies of that lens, so you might have to return it for another copy, and you might have to do that more than once:
http://www.bhphotovideo.com/bnh/controller/home?ci=0&shs=pentax+tamron+17-50mm&sb=ps&pn=1&sq=desc&InitialSearch=yes&O=jsp%2Fproductlist.jsp&A=search&Q=*&bhs=t
Another excellent choice would be the Sigma 18-50mm f/2.8. But note, it’s really closer to a 19-50mm f/3.0:
(note, don’t confuse this lens with the similar-sounding, but mediocre, Sigma 18-50mm f/3.5-5.6, which would be no better than your kit lens)
http://www.bhphotovideo.com/c/product/463426-REG/Sigma_581109_18_50mm_f_2_8_EX_DC.html
The new Pentax 17-70mm f/4.0 is getting excellent reviews, even better than the older Pentax 16-45mm f/4.0, which is also excellent:
http://www.bhphotovideo.com/c/product/567353-USA/Pentax_21740_SMCP_DA_17_70mm_f_4_AL.html
The Pentax 17-70 is a bit pricey because it just came out, but the Pentax 16-45 is excellent too and about US$100 cheaper:
http://www.bhphotovideo.com/c/product/315380-USA/Pentax_21507_SMCP_DA_16_45mm_f_4_0_ED.html
Pentax users are also generally very happy with the Sigma 17-70mm f/2.8-4.5:
http://www.bhphotovideo.com/bnh/controller/home?ci=0&shs=pentax+sigma+17-70mm&sb=ps&pn=1&sq=desc&InitialSearch=yes&O=jsp%2FRootPage.jsp&A=search&Q=*&bhs=t
The Pentax 16-50mm has excellent image quality and is also fully weather-sealed (as is your K20D). But it’s also expensive, big and heavy, and like the Tamron 17-50, there have been a lot of bad copies, so you might have to return one or two before getting a good one:
http://www.bhphotovideo.com/c/product/485180-USA/Pentax_21650_SMCP_DA_16_50mm_f_2_8_ED.html
Another option I would suggest seriously considering is an excellent prime (non-zoom), which will not only give you sharpness that only the very best zooms can approach, but will also give you much better bokeh (beautiful out-of-focus backgrounds) than even the very best zooms, and will be smaller and ligher than a zoom, and will let in more light than a zoom. I would suggest looking at the Pentax 35mm f/2.0. Although I have lots of zooms to choose from, I use this lens a lot:
http://www.bhphotovideo.com/c/product/180121-USA/Pentax_22190_Wide_Angle_35mm_f_2_0.html
Here’s a good place for reviews:
http://www.photozone.de/all-tests
Popular Photography magazine is also a good place to look for reviews:
http://www.popphoto.com/cameralenses
I also like to look through serious user reviews, and the Fred Miranda site is a good place for Tamron and Sigma lenses:
(whoops, I’m only allowed 10 links in an answer, so here’s a non-link)
dub dub dub dot fredmiranda dot com/reviews/index.php
The Pentax Forums website is a good place for user reviews of Pentax lenses:
(whoops, I’m only allowed 10 links in an answer, so here’s a non-link)
dub dub dub dot pentaxforums dot com/lensreviews/category-SMC-Pentax-DA-Zoom-Lenses.html
I’ve never had the kit lens, but I’ve had the Pentax 16-45 since it came out in 2004 and have been very happy with it. It’s very good at f/4.0 and razor sharp by f/5.6.
I recently bought the Tamron 17-50/2.8, mainly to throw unavoidably cluttered backgrounds further out of focus (by using f/2.8 rather than f/4.0), but also to get razor sharp performance by about f/4.0 instead of f/5.6, and thirdly to be able to shoot in half as much light (by using f/2.8 instead of f/4.0) while still getting very good sharpness, about as good as the Pentax 16-45 is at f/4.0.
However, my copy of the Tamron 17-50 had a front-focus problem. I decided to send it into Tamron rather than play games with the retailer, and also to ask them if they could loosen the zoom ring while they were fixing it. I was a bit disappointed when they told me, after I rushed the lens to them, that it would take them 3 – 4 weeks to do the repair. I’m still waiting for it. But for the couple days I had it, I was very pleased with it’s handling — it feels just right in my hand while shooting.
My advice —
If you’re not in a hurry and don’t mind returning the lens a couple times to get a good copy, it’s hard to beat the Tamron 17-50mm f/2.8′s bang for buck.
For the best likelihood of getting a good copy the first try, and also to avoid an overl
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