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03-20-2014, 07:24 PM   #1
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Pentax DA* 16-50 vs Sigma 17-50

New to Pentax would love some opinons of the Pentax 16-50 vs the Sigma 17-50
I bought a 16-50 and was really a nice lens but SDM motor was bad.
Wondering the quality of the Sigma vs the Pentax

03-20-2014, 07:26 PM   #2
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03-20-2014, 08:02 PM   #3
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I don't own the Sigma, but the color and IQ on my DA*16-50 is top notch and I'm very glad I purchased it. As a matter of fact it's such a nice lens that I don't feel the need for the FA 31 or 35 any longer.

I suggest you either send it in for repair or perform the screwdrive conversion. PJM1 did a fantastic job of putting together a simplified tutorial for the conversion. https://www.pentaxforums.com/forums/10-pentax-slr-lens-discussion/208353-how-...-2-8-a-19.html
03-20-2014, 08:16 PM   #4
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IMHO, the Sigma 17-50 f2.8 HSM non OS is a fantastic lens

03-20-2014, 09:39 PM   #5
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I tinkered around with the 17-50 HSM non OS, and, quite frankly, I don't know what the fuss is all about. Didn't seem any sharper on my K-3 and the focus was, despite all the claims I had heard to date, slower than the 16-50. It was brand new, mind you.

I wouldn't trade my DA* 16-50 for it for any reason.

-Heie
03-20-2014, 10:59 PM   #6
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Fix the lens if you can't send it back. Especially since you like it.
03-21-2014, 01:12 PM   #7
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I don't know about the DA* 16-50mm, but I have the Sigma 17-50mm, and I tried a couple of copies of the Tamron 17-50mm. The Sigma is an incredible lens, and better than the Tamron, IMO. (Bought it for $380 new from a Japanese ebay seller--a steal!)
03-21-2014, 01:35 PM   #8
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I see them on eBay from Japan sellers and they are really inexpensive I assume you had no problem with yours. Almost 200 less then in US just seems to good to be true.
Thanks for the input

03-21-2014, 01:46 PM   #9
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I researched all the options and ended up with the DA* 16-50, even though the Sigma 17-50 is currently available locally for less than 1/2 the price. Just got my DA* this evening, so I can't comment on its performance yet. Based on my research, it was the rendering, slightly wider field-of-view, WR and quick-shift manual focus that pulled me towards Pentax in this case. The Sigma is also a great lens, it just missed a few tick boxes for me compared to the DA*.
03-21-2014, 02:07 PM   #10
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I chose the Pentax 16-50, even though i knew of the SDM problems because:
it is wider (16mm is wide enough for at least 75% of what i shoot)
it is weather sealed. This is a lens that you can keep on your camera all the time without switching to a different lens. So WR is important in my opinion. If you are switching lenses all the time anyway, i guess it isnt as important.
You can easily convert to a screw drive. My SDM failed real quickly after i bough it...but i bought it fully expecting it to fail anyway. If you are shooting in churches, or weddings, the noisy screw drive may be of concern. TO me, it isnt.
03-21-2014, 02:13 PM   #11
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I am not sure what I will do at this point I get lots of people liking the Pentax but it is really unreliable as far as the SDM is I am not sure that I want to pay
1000 for a lens that will fail after a short time. I know it probably is better then the Sgma over all and I like the WR part but for 24 cents I can buy a plastic bag when it rains. Just not sure which way I will go
Thanks
Jim
03-21-2014, 02:25 PM   #12
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QuoteOriginally posted by tyrepeddler Quote
I am not sure what I will do at this point I get lots of people liking the Pentax but it is really unreliable as far as the SDM is I am not sure that I want to pay 1000 for a lens that will fail after a short time. I know it probably is better then the Sgma over all and I like the WR part but for 24 cents I can buy a plastic bag when it rains. Just not sure which way I will go Thanks Jim
The problem with plastic rainsleeves/bags is that water will get in there no mater what - it's going to happen if the rain is hard enough. And, now you are shooting through the plastic, further degrading your IQ.

I honestly think the SDM thing has been overblown, and like mentioned above, there is the screw-drive option.

I would seriously consider the 16-50 over the Sigma, and for peace of mind, a $35 warranty extension from MACK to extend the warranty for 7 more years (8 total).

But what is "unreliable" ? It is dead completely or only sometimes? And was this a brand new purchase from B&H/Adorama/Amazon? Return it for an exchange if so.

-Heie
03-21-2014, 02:33 PM   #13
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Weather sealing

I'm not well-informed on the weather sealing of the Sigma lens (don't believe it has it), so I went with the Pentax because I bought into this line largely so I can hike with the camera and not have to worry about rain, dust or snow. So if you plan on shooting in those conditions, the Pentax is worth the extra IMO. Keep in mind too that most of the SDM problems people reference have been resolved in the lenses built in 2012 and later. This is actually the first lens I bought for my K3 and it's done everything I've asked of it and then some so far.
03-21-2014, 02:40 PM   #14
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Does Pentax run lens sales like Nikon and Canon do
Maybe I just wait till they run one and get the 16-50
03-21-2014, 06:18 PM   #15
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QuoteOriginally posted by tyrepeddler Quote
Does Pentax run lens sales like Nikon and Canon do
Maybe I just wait till they run one and get the 16-50
Almost always on Black Friday weekend is a good sale. Pentax surprised us recently a couple weeks ago with a similar sale:

3-Day Pentax Lens Sale - Pentax Deals - PentaxForums.com

The DA* 16-50 was $896 16 days ago......
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