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06-14-2013, 07:16 AM - 1 Like   #31
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There's a lot of difference between 18 and 16mm, in terms of field of view, and even more between 35 and 50mm and the zoom ratios are quite different (slightly less than 2:1 for the Sigma and slightly more than 3.5:1 for the Pentax). I don't think it's valid to compare the two lenses, though people inevitably will, because its clearly much easier to design a zoom with a smaller range of focal lengths, than one which is greater, especially one with a large aperture. None of this detracts from the inherent qualities in the Sigma, especially at the price, but they are two quite different lenses.

06-14-2013, 08:05 AM   #32
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I join the good news camp.


At this price, a K-5IIs (or K-3) is a very good proposition almost matching what a possible full frame body may offer. Great it is coming to the K mount too.


APS-C 18-35/1.8 is a 35mm-equivalent of 27.5-53/2.8 (often referred to as 28-50).

So, from Sigma we got:

APSC 35mm-equivalent of 28-53/2.8 (f24 min), 29 oz., 800 USD
FF 35mm-equivalent of 24-70/2.8 (f22 min), 28 oz., 825 USD
(prices retrieved from Sigma US website today)

where according to early reports, the APSC version may be equally usable wide open (it remains to be seen how wide angle wide open corners at 28mm will compare). The APSC lens seems to use a slightly more complex design (e.g., 17 rather than 14 elements) but it doesn't translate to higher price (probably a deliberate marketing decision to conquer the big APSC standard zoom market now).

The result is that using the rigor of camera equivalence, a full frame camera will have no primary advantage anymore when equipped with a pro standard zoom.

This is important.

However, there are a few secondary advantages remaining for full frame: probably better corner resolutions at equivalent settings, better AF accuracy, 3x rather than a 2x zoom range. And there are secondary disadvantages: bulkier body, more expensive body.

Overall, I think this will breath new air into the APSC market and slow down its (read Pentax') erosion towards full frame and mirrorless. Well done, Sigma!

However, slow down doesn't mean stop. A 3x zoom is more versatile and faster full frame zooms are probably already on some drawing boards. And non-standard zooms are still f2.8 or slower for APSC.

QuoteOriginally posted by Cannikin Quote
I find it funny, and kind of sad, that this is the fastest wide angle AF lens available for Pentax, and it's a zoom. Pentax, where are my fast, wide angle (preferably WR) primes?
I guess this is normal and due to some retrofocus design contraints.

E.g., the probably best ultra wide angle lens for any camera smaller than medium format is the Nikkor 14-24/2.8G lens. Which is a zoom too. And 14/2.8 would require 9mm F/1.8 for APSC to be equivalent. Good luck to find any such prime
06-14-2013, 08:13 AM   #33
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72mm filter size! Forget about shooting unobtrusively. Still, if I hand the coin....
06-14-2013, 08:49 AM   #34
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PENTAX limited zoom plan can be discarded now. Late to the game, Sigma beat it.
If PENTAX have plan for limited zoom, they need to show it now (or leak).

Great pricing, just wonder should I spend $799 on this lens or $799 on the GR!

06-14-2013, 08:49 AM   #35
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This will cause me some serious consideration:

I have:

FA 31 Ltd
DA 15 Ltd
DA*16-50

And I wonder whether this new Sigma would be such an unnecessary overlap ... I would likely sell the DA*16-50 albeit loosing some "reach" but I do like the F1.8 aperture of the Sigma lens.

Any thoughts on that? Just wondering if I should or not consider it for an eventual purchase.

Cheers.

JP

Last edited by jpzk; 06-14-2013 at 08:50 AM. Reason: spelling
06-14-2013, 08:53 AM - 1 Like   #36
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QuoteOriginally posted by glanglois Quote
Makes me wonder if they will add Pentax mounts to some of the already-delivered glass.
I do hope this bodes well for a Pentax-mount version of the new Sigma 30mm f/1.4 Art lens!!
06-14-2013, 08:56 AM   #37
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QuoteOriginally posted by tzrenz0 Quote
they will re-badge this lens and we'll have a pentax limited zoom
and jack up the price by $300.

QuoteOriginally posted by wed7 Quote
no more daydreaming of Pentax's Limited zoom.
I still wouldn't mind seeing a fairly compact, all-metal, DA 20-40 f/2.8 or f/3.2 limited zoom from Pentax. Or just use the old FA 20-35 f/4 and make it metal, quick-shift, and about $600. I'm sure I'm dreaming though.
06-14-2013, 09:10 AM   #38
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With a price of $800 on Sigma 18-35/1.8, then Sigma 17-50/2.8 with a price of $670 seem a little overpriced. At least for Penax where you do not get OS.

I'm really impressed by the progress Sigma seems to have done the last few years. It seems that every lens the have released lately has class leading optical performance and best value. Before that Sigma only seemed to release lenses cheaper than OEM, but could not compete on optical performance (with a few exceptions).

06-14-2013, 09:13 AM   #39
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QuoteOriginally posted by LFLee Quote
PENTAX limited zoom plan can be discarded now. Late to the game, Sigma beat it.
If PENTAX have plan for limited zoom, they need to show it now (or leak).
,
Huh? Were there ever any rumors that the limited zoom would be a big heavy fast zoom?

I would expect it rather to be unusually small, well built and sharp, but with a moderate largest aperture.
06-14-2013, 09:28 AM   #40
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Great price. I'm in the same boat as JP. considering selling my DA*16-50 and DA14mm to fund buying this. Hmmmmm......
06-14-2013, 09:41 AM   #41
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QuoteOriginally posted by grhazelton Quote
72mm filter size! Forget about shooting unobtrusively. Still, if I hand the coin....
This is true. But the DA* 16-50 requires a 77mm filter.
06-14-2013, 09:44 AM - 1 Like   #42
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QuoteOriginally posted by Fogel70 Quote
With a price of $800 on Sigma 18-35/1.8, then Sigma 17-50/2.8 with a price of $670 seem a little overpriced. At least for Penax where you do not get OS.

I'm really impressed by the progress Sigma seems to have done the last few years. It seems that every lens the have released lately has class leading optical performance and best value. Before that Sigma only seemed to release lenses cheaper than OEM, but could not compete on optical performance (with a few exceptions).
And consider this: You can buy both this Sigma 18-35mm f/1.8 and the new Sigma 17-70 f/2.8-4.0 for less money than a new DA* 16-50mm f/2.8 costs right now. And the two Sigmas can share filters.
06-14-2013, 10:26 AM   #43
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This news is now official, FWIW: Sigma 18-35mm F1.8 Coming for Pentax - Pentax-Related News - PentaxForums.com

Adam
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06-14-2013, 10:48 AM   #44
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Mmmm...I see one of these + a 50-135 in my future B)
06-14-2013, 10:54 AM   #45
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QuoteOriginally posted by LFLee Quote
PENTAX limited zoom plan can be discarded now. Late to the game, Sigma beat it.
If PENTAX have plan for limited zoom, they need to show it now (or leak).
I don't think a Limited zoom is intended for the same market segment. The Limited zoom is a lens built for compact size and moderate zoom range and optimized for image quality. It won't be fast. You can be sure that the Sigma will be pretty awful regarding flare, but interesting lens anyway.
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