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06-03-2013, 12:06 PM   #16
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You guys are awesome, thanks for all the information!

06-03-2013, 12:08 PM   #17
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QuoteOriginally posted by yellowbrick Quote
I assume the shorter range means the zoom should produce better image quality than the 18-135, right?
I don't know that to be true. The DA 18-55 is shorter than either and I felt the 18-135 had better IQ than the 18-55.
Only thing better with the 18-55 was that it allowed closer focus.
Obviously not a direct comparison to the Sigma 17-70, it could be spectacular.
06-03-2013, 12:08 PM   #18
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QuoteOriginally posted by yellowbrick Quote
You guys are awesome, thanks for all the information!
You're quite welcome! Good luck with the purchase, and let us know what you decided! For the convenience of a zoom, you should be happy with any of these options, but remember that the DA limited primes have "pixie dust" image qualities that the zooms probably can't reproduce, so keep your expectations in check...
06-03-2013, 12:14 PM   #19
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QuoteOriginally posted by crewl1 Quote
I don't know that to be true. The DA 18-55 is shorter than either and I felt the 18-135 had better IQ than the 18-55.
But if the OP is primarily concerned about whether the shorter range of the 17-70 models (either from Sigma or Pentax) means better IQ compared to the longer range of the 18-135, that's probably "in general" true. I remember reading past posts that claimed the DA 17-70 is "a bit" better IQ than the DA 18-135 but for lots of users of WR bodies, they are willing to give up some IQ for the WR and longer zoom range of the 18-135.

Then again, I remember reading a post that said that if WR was not a necessity, then the DA 18-135 loses some of its appeal strictly from an IQ standpoint, and thus the DA 17-70 or Sigma 17-70 lenses may be better choices to mate with non-WR bodies...

The optics in the kit lens DA 18-55 are not as good as the 18-135, according to many users (and my own experience). So that's an exception to the shorter zoom = better IQ rule-of-thumb...

06-03-2013, 12:30 PM   #20
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If the 17-70 was WR too I'm sure that it would be way more common. Now it just loses out to the 18-135 if you use a WR body.
06-03-2013, 02:09 PM   #21
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QuoteOriginally posted by VisualDarkness Quote
If the 17-70 was WR too I'm sure that it would be way more common. Now it just loses out to the 18-135 if you use a WR body.
Agreed, that must be what happened. When the DA 17-70 was released, it had to compete with the Sigma 17-70 (first version) that was well-regarded and already owned by many users. So not a lot of adoption there, plus it's not like the DA 17-70 was cheap. Once Pentax released the 18-135 WR, it seems like there was even less of a market for the DA 17-70 unless image quality was the most important factor. If only the 17-70 was fully WR (it has a rubber O-ring at the lens mount) then I bet more people would be interested because apparently its image quality is quite good. Oh well.
06-03-2013, 03:36 PM   #22
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Just in case you're thinking about the Sigma 17-70 Contemporary: I recently tried it out at a fair here in Berlin. Its very compact and light (compared to the 17-50) and its HSM is really very quiet. I think it would suit the K-01 perfectly and it's only marginally heavier than the 18-135.
I liked this lens, but after a short test I'm still a little sceptical about Sigmas colour reproduction and flare resistance. Of course that's less important if you mainly do indoor shots.
06-03-2013, 05:20 PM   #23
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Thanks for the feedback, geedee! It's nice to hear a first-hand account of the Sigma lens. I'll have to think long and hard about which direction I want to go in. I'm thinking, for the moment, about getting the Sigma 17-70 now, and then maybe getting a 18-135 WR as a discounted bundled-deal with a future WR camera body. Not sure if having both lenses would be redundant, though.

06-03-2013, 06:52 PM   #24
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I've been unable to get either of my Sigma HSM lenses (17-70 & 18-250) to focus reliably on my K-01.

Just a heads-up!
06-03-2013, 07:37 PM   #25
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QuoteOriginally posted by K(s)evin Quote
I've been unable to get either of my Sigma HSM lenses (17-70 & 18-250) to focus reliably on my K-01.

Just a heads-up!
I wonder if it's a firmware issue on the part of your particular Sigma lenses; if the new Sigma lens has the latest firmware, it should work with the K-01. At least, I assume?? My Sigma 50-150 HSM works fine with my K-01; it's a big lens on there but the focus seems to work reliably and quietly.

Last edited by seventysixersfan; 06-03-2013 at 07:44 PM.
06-03-2013, 09:39 PM   #26
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QuoteOriginally posted by yellowbrick Quote
Thanks for the feedback, geedee! It's nice to hear a first-hand account of the Sigma lens. I'll have to think long and hard about which direction I want to go in. I'm thinking, for the moment, about getting the Sigma 17-70 now, and then maybe getting a 18-135 WR as a discounted bundled-deal with a future WR camera body. Not sure if having both lenses would be redundant, though.
This was exactly the scenario I was thinking. So I got the Sigma 17-70 (first gen). Now I got the 18-135 bundled up. Only problem is, now I got both K5ii and K5. So thinking of getting rid of K5 and the Sigma as well. My advice is to go with 18-135. Price is not too far off the Sigma. I find that the extra reach is very convenient when shooting school plays, concerts, recitals. And the silent zoom is real nice.
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