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10-11-2011, 05:45 PM   #1
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Sigma 17-50 or Sigma 17-70

Read the comparisons of the f2.8 standard zooms and it convinced me to go Sigma (I want silent focus so the Tamron is out). Several readers commented on the Sigma 17-70 as well. Any thoughts on the difference between the two optically? I take a fair number of photos indoors in low light and at night so the extra speed of the 17-50 is attractive, but so is the 17-70's extra range, macro (and price).

10-11-2011, 06:34 PM   #2
hcc
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You may be interested to read the Users' reviews:
Sigma Lenses for Pentax: Current Zoom Lenses - Pentax Lens Review Database

Sigma 17-50mm F2.8 EX DC OS HSM Lens Reviews - Sigma Lenses - Pentax Lens Review Database
Sigma 17-70mm F2.8-4 DC Macro OS HSM Lens Reviews - Sigma Lenses - Pentax Lens Review Database

You may be interested to read in details each user review because a PF member had obviously an issue with the 17-50mm, possibly a faulty copy.

However you may also consider an used copy of the older Sigma 17-70mm:
https://www.pentaxforums.com/userreviews/sigma-17-70mm-f2-8-4-5-dc-macro-af-lens.html

since you do not need lens OS. A 2nd hand copy may be better value.

Hope that the info can assist.

Last edited by hcc; 10-11-2011 at 06:57 PM.
10-12-2011, 12:21 AM   #3
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Thanks. I read those reviews as well as SLRGear, DPReview and B&H reviews and got pretty consistent positives on both lenses. Guess I'm most interested in the low-light capability of the 17-70 combined with a K5. I was originally thinking the constant 2.8 aperture was what I wanted but given the improved iso performance of the K5, maybe the 17-70 is adequate. (FYI, I'm currently using a Pentax 18-250, not a good low-light performer, main problem being the AF doing a lot of hunting and almost forcing MF only).
10-14-2011, 12:24 AM   #4
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I tried a Sigma 17-70mm f/2.8-4.0 on my K-x, but it had problems focusing.
It works well on my K-5, but still I prefer the Tamron 17-50mm f/2.8 any day. The AF noise doesn't bother me at all, and I doesn't miss the extra 20 mm. The Sigma feels clumsy compared to the Tamron.

10-14-2011, 04:53 AM   #5
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I think they are different animals. The 17-70 is more versatile (range, macro) and the 17-50 is faster. At the end of the day, both will deliver great pictures, it's up to you to decide the features you want.
10-14-2011, 10:53 AM   #6
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QuoteOriginally posted by bdery Quote
I think they are different animals. The 17-70 is more versatile (range, macro) and the 17-50 is faster. At the end of the day, both will deliver great pictures, it's up to you to decide the features you want.
That is both fair and balanced.
10-14-2011, 04:28 PM   #7
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I've currently got the older (2.8-4.5, no HSM/OS) 17-70mm on my K-5 and I have to say its a decent combo, far more balanced than my K-x with similar capability. I will say though that the 2.8 aperture on the lens is limited and I tends to drop off rapidly beyond ~20mm. Just something to keep in mind if you want speed but its a good lens overall.
10-15-2011, 07:15 AM   #8
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I too have the older 17-70 2.8-4.5.
Bought it second hand and it is a nice lens.
Really depends if you need the extra range or a constant 2.8...only you can decide on that.
When I bought this lens, I was considering the Tamron 28-75 or the Sigma.
In the end it went down to the wider short end. The macro function is useful.
All in all, it's a great walk around lens.
Use it with a K10.

10-15-2011, 07:44 AM   #9
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QuoteOriginally posted by mickey Quote
I too have the older 17-70 2.8-4.5.
Bought it second hand and it is a nice lens.
Really depends if you need the extra range or a constant 2.8...only you can decide on that.
When I bought this lens, I was considering the Tamron 28-75 or the Sigma.
In the end it went down to the wider short end. The macro function is useful.
All in all, it's a great walk around lens.
Use it with a K10.
Same here, except I had a 28-75 until recently. I wanted a casual one-lens option, but 28 was not wide enough. So, I chose focal length over aperture.
10-15-2011, 07:49 AM   #10
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I have the 17-70 EX from Sigma. The weight is something to get used to. It is a really good lens and work great witk my camera. Never had any problems
10-15-2011, 06:09 PM   #11
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The 17-70 makes a great walkaround lens.
If you get the 17-50 OS, you should be happy with it too...really depends whether you like narrow DOF or not. I think I'd choose the 17-50 if I could do it over, but then I'd wish it were a bit longer and wish I had the 17-70 :-)
10-16-2011, 12:32 AM   #12
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Thanks everyone for the feedback. I just ordered the 17-70. Got a really great deal and figured I'd try it.
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