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01-23-2014, 04:39 PM   #1
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Sigma 17-50mm F2.8 or Tamron 17-50mm F2.8

I'm looking to upgrade my Pentax 18-55mm kit lens as of now with a faster lens with better IQ and sharpness. The Pentax 16-50mm would be out of question as of now for the $$$$$ factor. In my most resent findings the Sigma edges the Tamron out in the Canon and Nikon world but can't really find which is choice in for the Pentax mount about both, just for the Tamron and Pentax. I've read this Sigma 17-50mm F2.8 vs Tamron 17-50mm F2.8 vs Pentax DA* 16-50mm F2.8 but seeing that they seem to change with the most resent model I'm looking for opinions to help guide me. I am fairly new and shoot with a K-30 but if need be will upgrade to a different model that is capable of producing better images. Currently at B&H the Sigma with $100 rebate is $469 vs Tamron's $499 (with some searching I can find them for cheaper if needed).


I think my current direction will be headed in the direction of landscape and marco. I 've heard that renting and testing before buying is a good place to head and if anyone has any other directions in lens choices in where to start that would also be great.

01-23-2014, 04:55 PM - 1 Like   #2
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FWIW, the lenses tested in that review are still current, except that the Sigma lens no longer includes in-lens OS.

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01-23-2014, 04:56 PM   #3
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If you are interested in landscape and macro maybe consider if you really want 1 of these lenses

You will certainly want to get a dedicated 1:1 macro lens for macro at some point, and there are better options for landscape depending the type of landscapes you are wanting to shoot

I had the Tamron 17-50 f2.8 and it was great, perfectly sharp, but I just didn't use it. I went for my 10-20mm or 30mm prime almost all the time, unless I was using the 50mm end, so I got rid of the 17-50mm and got something a little longer
01-23-2014, 05:51 PM   #4
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QuoteOriginally posted by jezza323 Quote
If you are interested in landscape and macro maybe consider if you really want 1 of these lenses

You will certainly want to get a dedicated 1:1 macro lens for macro at some point, and there are better options for landscape depending the type of landscapes you are wanting to shoot

I had the Tamron 17-50 f2.8 and it was great, perfectly sharp, but I just didn't use it. I went for my 10-20mm or 30mm prime almost all the time, unless I was using the 50mm end, so I got rid of the 17-50mm and got something a little longer
I was thinking along those lines but did hear that at 16mm you tend to get a curving of sorts at the outer parts of the picture if you don't get the "right " lens. My current thinking with 17-50
was that I could use he higher (50) for inside shots. I did have a 50 prime for that but it did succumb to cold weather and died.


As for macro I do have a reversal ring for now and in the future was thinking maybe a 300mm or 400mm prime and adding a teleconverter for more reach and a macro coupler for the other side.

01-23-2014, 05:55 PM   #5
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Correction, that B&H rebate brought the Sigma down to $569,
01-23-2014, 05:55 PM   #6
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Don't get me wrong, not saying these lenses aren't right for you, just wanted to give an alternate option
01-23-2014, 06:10 PM   #7
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I think that was very helpful. I am trying to seek the impossible with the best do all lenses. Ha Ha. But I'm not a pro so that could be somewhat more feasible.
01-24-2014, 06:19 AM - 1 Like   #8
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There are only two issues I know of with Tamron:

1. focus adjustment somewhat likely to be required, which may be beyond the camera's non-debug range. This may or may not be able to be fixed by Tamron.

2. focus field curvature at wide settings - this is a design "feature" and can't be fixed, and may or may not affect you. Do not buy this lens if you want to take pictures of (parallel to you) brick walls at 17mm f2.8 (think f16 here.)

I don't have any experience with the Sigma, although my first copy of the 10-20mm was alarmingly soft on one side. My first copy of the Tamron was uniform across the frame.

Regarding non-focus issues, a comparison with Nikon versions should be equally applicable to Pentax. Canon uses a different sensor size, so for example some of my Pentax 55-300s would have been "less unacceptable" had I managed to attach them to the front end of a Canon, so the worst-performing parts of the image circle would have been cut off.

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