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06-20-2013, 05:17 PM   #1
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Sigma 17-50

I bought the Pentax DA*50-135 about a year ago and really like it. I'm using my Tokina 28-70 2.8 that I bought a long time ago before I switched to digital (K-5). 28 really isn't wide enough and it will not focus at that focal length. Tokina may be able to calibrate it to work but I want something different anyways. I was waiting for Pentax to come out with a new DA* short zoom but it doesn't look like it will be anytime soon. I debated getting the current DA*16-50 but would rather see what they come out with to replace that one. In the mean time I'm looking at the Sigma 17-50 2.8 because it is a lot cheaper than the Pentax and I could use the Sigma until the new Pentax came out. I don't know if that would be wise to do or not. My choices are to just keep using what I have, buy the Pentax DA*16-50, or buy the Sigma 17-50 and then get the new Pentax zoom when Ricoh releases it. What would you do given these choices? Thanks in advance for any input and advice you may have.

06-20-2013, 06:01 PM   #2
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I have the Sigma 17-50 f2.8 and unless you need WR, you'll never need to cover that range with another lens...JMHO
06-20-2013, 06:04 PM   #3
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QuoteOriginally posted by Jool Quote
I bought the Pentax DA*50-135 about a year ago and really like it. I'm using my Tokina 28-70 2.8 that I bought a long time ago before I switched to digital (K-5). 28 really isn't wide enough and it will not focus at that focal length. Tokina may be able to calibrate it to work but I want something different anyways. I was waiting for Pentax to come out with a new DA* short zoom but it doesn't look like it will be anytime soon. I debated getting the current DA*16-50 but would rather see what they come out with to replace that one. In the mean time I'm looking at the Sigma 17-50 2.8 because it is a lot cheaper than the Pentax and I could use the Sigma until the new Pentax came out. I don't know if that would be wise to do or not. My choices are to just keep using what I have, buy the Pentax DA*16-50, or buy the Sigma 17-50 and then get the new Pentax zoom when Ricoh releases it. What would you do given these choices? Thanks in advance for any input and advice you may have.
I'm on the same situation,I Also have the 50-135, the 12-24, and waiting for something on that range, preferable 17-70mm, There is a new Sigma 17-70 f/2.8-4 DC Macro HSM for Pentax, I would love to see some reviews here
06-20-2013, 06:42 PM   #4
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I can say for a fact, as a 17-70 owner, I wish I'd bought a constant 2.8 instead. The difference between 50mm and 70mm can be covered by leaning forward slightly.

06-20-2013, 06:45 PM   #5
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I own the 50-135, and I have owned the tamron 17-50 and Pentax 16-50. I finally settled on the Sigma 17-50. I love the Sigma.
06-20-2013, 07:58 PM   #6
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I have the Sigma 17-50 f2.8. I think that it's a good lens. I bought the Pentax 16-50 2.8 at the same time for testing. I returned the Pentax, even though at that time the prices were essentially the same. The CA on the Pentax was much worse. I only have the Sigma lens for now, but I'm wondering about buying the Pentax 12-24.
06-20-2013, 08:26 PM   #7
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Not to forget that Sigma now have 18-35 f1.8, which looks to be a ripper!
06-21-2013, 03:25 AM   #8
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I was undecided.....and bought DA16-50 plus Sigma 17-50 from bh.....

Six months later, Pentax is exhibiting early sign of sdm failure.....

Sigma is sharp and still going.

I love both lenses but if i have to choose again, i will get the Sigma.
All the best!

06-21-2013, 03:34 AM   #9
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Sorry for a quick thread derail - Anyone who has used both the 17-50 and Sigma 24-70 able to tell me which one is sharper at f2.8?
06-21-2013, 07:13 AM   #10
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QuoteOriginally posted by dh87 Quote
I have the Sigma 17-50 f2.8. I think that it's a good lens. I bought the Pentax 16-50 2.8 at the same time for testing. I returned the Pentax, even though at that time the prices were essentially the same. The CA on the Pentax was much worse. I only have the Sigma lens for now, but I'm wondering about buying the Pentax 12-24.
I have the Pentax 12-24mm and I love it, some of my best pictures are with this lens, really sharp, some CA but easily corrected with Lightroom, click on the Flickr link on my signature and you can see some of the pictures, I would consider also the Sigma 8-16 everybody says it is very sharp also.
06-21-2013, 08:40 AM   #11
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Sigma 17-70 vs 17-50 on DXOMark

Very good comparison on DXOMark, compared on Nikon D7000 (same sensor as K5), The 17-50 is definitely Sharper with 10 perceptual MPixels vs 8 MPixels on the 17-70 for that sensor.

: DxOMark - Sigma 17-70mm f/2.8-4 versus competition
06-28-2013, 08:54 AM   #12
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Ordered the Sigma

I finally decided to order the Sigma. My Tokina 28-70 2.8 just isn't wide enough and with not being able to autofocus at the 28mm end I decided it's not worth getting it recalibrated and just put the money towards a lens that was made to work with digital SLRs. I had a cheaper Sigma (70-300 I think) years ago that took great pictures but the construction was not that great. I hope this one takes that good of pictures and is hopefully better constructed. I do wish it was weather sealed but I will just have to be more careful with it. Thanks for all your advise in making this decision. Hopefully B&H will get it here before I leave for my trip. I paid for express shipping but you still never know.
06-28-2013, 09:18 AM   #13
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I think you'll love it, my favourite zoom by a country mile!
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