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04-10-2008, 07:48 PM   #31
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QuoteOriginally posted by Mike Bokeh Quote
It has a little trouble focusing in very dim light, but when it does this, I just ask people to move to a more well lit location.
Or use the quick-shift and go manual.

It does indeed focus poorly in dim light but I blame the camera since my other lenses have the same problem.

04-10-2008, 07:49 PM   #32
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Hi Peter.

16-45 is a great lens but it is prone to Ca and its bokeh can be quite chalky at times.

Otherwise it seems to be a more reliable lens with predictable performance.
04-10-2008, 07:54 PM   #33
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[QUOTE=rparmar;216960]Or use the quick-shift and go manual.

Yes, that too. I've just started using manual focus recently.

Mike
04-10-2008, 09:02 PM   #34
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I appreciate the advice of all who posted. It's down to the Sigma 17-70 or the DA16-45. Frankly the DA* is just too expensive for the marginal differences and the fact that it's hard to get a copy with out BF issues.

The plus for the Sigma is the slightly longer range and F2.8 at the wide end where I'll use it the most. The size is great as well, smallest of the 3 by far. Negative is Variable aperture and relatively slow at the long end.

16-45 Pluses, quick shift, constant aperture, constant results. Negative, slower through the range. Seems a bit softer when wide open.

Thanks everyone!!

04-10-2008, 10:31 PM   #35
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Froom photozone.de resolution tests:

Sigma 17-70@17mm
F2.8
Center=1944; Border=1739.
F4
Center=2053.5
Border=1860

Pentax 16-45@16mm
F4
Center=2281
Border=1899


I don't know about the lens You testet, but Photozone's lens kicks Sigmas butt. And my 16-45 is extremely sharp at 16mm F4 too. Pentax reaches its maximum sharpness at F5.6, but sigma at F8. I prefer F5.6 much more.
04-11-2008, 04:12 AM   #36
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I recently faced exactly the same decision. Here's my view of the 16-45mm compared with the Sigma 17-70mm.

Negatives:
  • Slower at wide end.
  • Noticeable CA at 1:1 pixels, in shots with high contrast straight lines. Easy fix in editor.
  • Shorter by 25mm on long end.
  • Lens is longer (92mm versus 82.5mm) and extends at wide angle -- might scare small children in close quarters.
Positives:
  • Best edge-to-edge resolution figures.
  • Quick shift focus system.
  • Constant aperture.
  • Wider field of view by 1mm.
  • Great colour rendition.
  • Very flat focus field.
  • Lighter by 90g.
  • Less distortion wide than Sigma (likely not significant though).
  • No flare.
  • Comes with lens hood that has a window for circular polarizer.
  • 67mm filter size versus 72mm.

I should note that although the Sigma is called a "macro" this is misleading. The minimum focus distance is 20cm, not that much closer than the Pentax at 28cm. I think that's about a foot for those of you still on Imperial units.

If you are generally centering moving subjects then the Sigma one-stop advantage wide, plus greater range flexibility, might make it the best choice. If you need sharpness to the edges (landscapes, urban environs, wide group shots) and don't mind switching to a tele lens for other scenarios, then the Pentax wins out.

Recalling that your application is a wedding (and taking into account I have never done one) I would suggest the 16-45mm on your K10D, to use with bounced or diffused flash (tripod in the church instead, depending on what is allowed). On your K110D switch between your Tamron 90 and FA31 for available light and extreme DOF shots. I think that would be quite flexible.

P.S. Hope spring has come to PEI.
04-11-2008, 04:33 AM   #37
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QuoteOriginally posted by rparmar Quote
I should note that although the Sigma is called a "macro" this is misleading. The minimum focus distance is 20cm, not that much closer than the Pentax at 28cm. I think that's about a foot for those of you still on Imperial units.
Actually that depends on the selected focal length. At the wide end, if i recall correctly, you can focus so close with the sigma 17-70 that the object touches the filter on the lens. That said, I'm not a big fan of the sigma, I'm slowly moving over to primes.
04-11-2008, 07:48 AM   #38
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QuoteOriginally posted by Gimbal Quote
Actually that depends on the selected focal length. At the wide end, if i recall correctly, you can focus so close with the sigma 17-70 that the object touches the filter on the lens. That said, I'm not a big fan of the sigma, I'm slowly moving over to primes.
Sorry for the misinformation. I had never heard this about the Sigma.

As for primes, I am all "primed up" about the upcoming 15mm limited. If it's really, really good and small it might replace the 16-45mm for me.

04-11-2008, 01:20 PM   #39
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Just thought I would chime in and say that the DA 16-45mm is a great lens. I do alot of outdoor and landscape photography and this lens is almost always on the camera, unless I am doing something different.

Just to show how sharp this lens is, here is a shot I took at 16mm.

04-11-2008, 07:57 PM   #40
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Well everyone a 'new to me' DA16-45mm is on the way to PEI. I posted a WTB earlier today and Dan from Washington state sold me his at a fair price. Only problem was he sent me some pictures of the lens using a VT125. Some beautiful pics of a lens.

Does the LBA ever stop.... Must resist. I don't need that lens.
04-11-2008, 07:59 PM   #41
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Thanks everyone for the pictures, thoughts and experiences. Hopefully this ones put to bed.
04-11-2008, 10:13 PM   #42
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Im very happy with my Pentax 16-45...it works well with my K10D.
04-12-2008, 04:47 AM   #43
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QuoteOriginally posted by Peter Zack Quote
Thanks everyone for the pictures, thoughts and experiences. Hopefully this ones put to bed.
Happy shooting!
04-12-2008, 05:17 AM   #44
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QuoteOriginally posted by Tuner571 Quote
Just thought I would chime in and say that the DA 16-45mm is a great lens. I do alot of outdoor and landscape photography and this lens is almost always on the camera, unless I am doing something different.

Just to show how sharp this lens is, here is a shot I took at 16mm.
Btw Tuner, very good shot in many respects. Looking forward to getting my copy of this lens.
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