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03-23-2008, 09:20 AM   #16
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Aaah,

UV filter in place - that sort of makes sense but....

fitting a Hoya Pro 1 D filter or other "slim" filter stops this, no vignetting whatsoever.

Simon

03-23-2008, 09:24 AM   #17
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I have been watching the thread with great interest. I shoot about 50% of my shots between 16 - 80 . I was thinking about the DA* zoom twins , however I may now be thinking on Sigma 17-70 and the DA* 50-135 .... man it never gets easier to pick a lens or two
03-23-2008, 11:03 AM   #18
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QuoteOriginally posted by thear Quote
You can't really blame the lens if you're putting an old fat filter in front of it!

I actually bought the 17-70 because of the lack of vignetting, which made me almost hate the 18-55.
03-23-2008, 11:10 AM   #19
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I tested the lens on a white wall without filter and vignetting still shows at 17mm.

03-23-2008, 04:36 PM   #20
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QuoteOriginally posted by thear Quote
I tested the lens on a white wall without filter and vignetting still shows at 17mm.
I checked out some shots taken at 17mm - no vignetting with my copy of the lens.

Last edited by superfuzzy; 03-23-2008 at 06:15 PM. Reason: typo
03-23-2008, 05:57 PM   #21
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I've rarely noticed any vignetting with mine and I shoot a lot at the wide end, mostly 17mm.
03-23-2008, 05:59 PM   #22
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I'm guessing that the filter is causing the vignetting. Try a Hoya Pro1 extra slim or similar
03-23-2008, 07:08 PM   #23
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Check these out: Picasa Web Albums - HeatherB - Flower pics
All but the first 2 were taken with the 17-70. I love it's close-up feature.

Heather

03-23-2008, 07:38 PM   #24
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A macro shot I took with the Sigma 17-70mm and k100d
03-23-2008, 08:29 PM   #25
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QuoteOriginally posted by thear Quote
I tested the lens on a white wall without filter and vignetting still shows at 17mm.
No lens has zero vignetting, specially wide-angle zooms. Check the charts here Sigma AF 17-70mm f/2.8-4.5 DC (Pentax K) - Review / Test Report and compare to the kit lens or other zooms. The Sigma is one of the best zoom lenses out there.
03-24-2008, 08:22 PM   #26
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QuoteOriginally posted by AndrewShirley Quote
I would take an f/2.8 to f/4.5 over a constant f/4 any day
Ditto to that

I'm pretty happy as the lens doesn't get in the way of the K20D's flash, even at 17mm. It created a shadow from the flash up to about 24mm on my old istDs.
03-24-2008, 08:28 PM   #27
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Mine got delivered today. Can't wait to test it out
03-24-2008, 08:36 PM   #28
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Dang, I was waiting for the Pentax 17-70/4, but you guys are making me think twice! What Pentax has going for me is SDM though... paired with the DA* 60-250/4? sweet!!!
03-25-2008, 05:23 PM   #29
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I just got back from a 10 day trip to San Miguel de Allende, Mexico, with pro photographer Mike Matlach. Mike was a perfect host who spared no effort to make the trip a success, and although I took along a Sigma 10-20mm, a Sigma 30mm f/1.4, a Pentax 50mm f/1.4, a Sigma 70-300mm, and a Kenko 1.5x TC (I couldn't justify lugging the Bigma along), I would guess that at least 90% of my images were made with the Sigma 17-70 f/2.8-4.5 lens. In my opinion it's just a great walk-around lens which makes very sharp images even in the low-light conditions found in most cathedrals. Don't forget the K10D's shake reduction feature which can make hand-holding possible down to 1/10th or so of a second, and kicking the ISO up to 800 causes only very minimal (to my eye at least) image degradation.

CN
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