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06-11-2013, 01:03 AM - 1 Like   #16
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QuoteOriginally posted by rawr Quote
Why stop at 70mm? How about ~20-105, and add the same AF motor as the 18-135, plus WR. Even if it were a constant f4, covering ~20-105 would be great for shooting gigs.
I'd say that 3-4 times zoom is about the limit for manufacturing a zoomlens that still retains great IQ - beyond that range the laws of physics and nature kick in and optical compromises across a too wide zoom range will decrease pure optical quality very rapidly.

However tempting these extreme zoom ranges are, the best compromise between the pure IQ of using primes (continually switching lenses) and the flexibility of zooms (and ability to just get the shot) can be had by using zooms that have limited zoom ranges. Examples are the obvious 17-50mm/f2.8, 50-135mm/f2.8, 8-16mm/f4.5-5.6, 28-75mm/f2.8, 17-70mm/f4, 24-70mm/f2.8 etc. of various Pentax and 3rd-party lineage.

Larger zoomranges can definitely be a plus in situations where you can only carry one single lens and they do serve their purpose but short of moving to using only primes, the best IQ/cost/flexibility compromises can usually be found by breaking a zoomrange up into 2 lenses.

Example: rather than using the (otherwise excellent) DA18-135mm, you'd get a boost of IQ by using a 17-50mm/f2.8 (or one of the 17-70's) and the DA*50-135mm/f2.8

Add the 70-200mm/f2.8 (Tammy or Sigma) and you cover the range of a 18-200mm but with more low light capability and infinitely better optical quality.

Superzooms do serve a purpose though and it is fantastic they can be manufactured in the first place but, to me, grabbing an 18-250mm would be an act of desperation. Let's face it: I'm too darned lazy to use primes but too picky to use superzooms!

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Last edited by newmikey; 06-11-2013 at 01:10 AM.
06-11-2013, 03:54 AM   #17
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My model lens in this category is the Canon 24-105 f4 L. By all accounts it is quite decent optically and the AF is nice too.

While I already own several zooms that overlap that whole 18-200 range, I still admire the Canon. Nearest I can get to it is my A 35-105 f3.5, but while it's a lovely lens, it's MF, which is a disadvantage for me in low-light gigs and events, and it is still a bit long at the wide end too. A full-frame Pentax 24-105 f3.5 WR on a FF Pentax DSLR would be my ideal lens in this category
06-11-2013, 04:17 AM   #18
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QuoteOriginally posted by rawr Quote
A full-frame Pentax 24-105 f3.5 WR on a FF Pentax DSLR would be my ideal lens in this category
Which more or less exactly corresponds to a fictional 17-70mm on APS-C though we're far off from that aperture range...
06-13-2013, 11:10 AM   #19
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Hi, i currently have the sigma 17-70 2.8-4 OS... Will the new "C" version be an upgrade or should i stick with this version? I've seen reviews but still have mixed feelings, Thanks.

06-13-2013, 11:17 AM   #20
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I don't think you would gain much by upgrading to the C version. a bit lighter and more compact, a little sharper at 70mm, but otherwise, it appears not to be worth spending the money/effort to swap from version 2 to version 3. Spend your money on other lenses!
06-21-2013, 09:31 AM   #21
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So, has anyone actually *used* this lens in Pentax mount yet? I'm thinking of upgrading from Version 1, which I really like, but the new one would be a bit faster, with quieter (and hopefully quicker) focus and it looks great...
06-21-2013, 11:40 AM   #22
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Looks like Adam has used it, see this post where he shows samples taken with the lens mounted on a new K-50:
https://www.pentaxforums.com/forums/pentax-k-50/228462-pentax-k-50-sample-photos.html
06-21-2013, 02:42 PM   #23
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Here's the 17-70mm on the K-50

No complaints about the AF whatsoever. It works as it's supposed to- quickly and w/o being noticed/

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06-21-2013, 02:46 PM   #24
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now that's some great camera/lens porn! Looks real nice...
06-22-2013, 08:01 AM   #25
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Thanks Adam - looking good! I wonder when/if the price will go down a little ($429 and it's a done deal for me)...

BTW, more pics in this dpreview thread...

Last edited by Doundounba; 06-23-2013 at 09:38 AM. Reason: Add link to dpreview thread.
06-24-2013, 01:53 PM - 1 Like   #26
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QuoteOriginally posted by Doundounba Quote
Thanks Adam - looking good! I wonder when/if the price will go down a little ($429 and it's a done deal for me)... BTW, more pics in this dpreview thread...
Thanks for the link to the other forum's pics. The new Sigma definitely looks smaller and more compact than the DA 17-70, certainly in terms of length but interestingly, even with the 72mm filter size compared to the DA's 67mm size.

I would snap this up if there was an instant rebate offer that brought the price down to $429. I would even settle for $450. May need to wait until the end of the year sales to see if anything happens. Of course, if this lens is a big hit, they may not need to offer a rebate or discounts on it. $499 seems pretty reasonable for what this offers.
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