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12-29-2006, 01:31 AM   #1
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Sigma 17-70 vs. Pentax 16-45

Hello everyone

I'm new here. Just got myself a K10D and it is sure a nice dslr!
The thing is, when I bought the K10, the store didn't have the pentax DA 16-45 lens that I initially wanted.

So instead I got the sigma 17-70 f2.8-4.5 MACRO as my starter lens. It cost $50CDN more and it has MACRO. The store guy said I can exchange it for the DA lens when its in stock in a few days.

The question is, should I keep the sigma or get the pentax lens for $50 less? I heard the quality on the pentax is much better. But I might miss the macro ability on the sigma.

pls advice!

12-29-2006, 04:42 AM   #2
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The Sigma does suffer the usual Sigma sample variation in QC. If you are satisfied with the Sigma, keep it. From all reports if you get a good one, it is a fine lens. It is also a nice focal length range.

That being said, the Pentax DA 16-45 is a really fine lens also, with the typical Pentax image rendering style.

-Alan
12-29-2006, 09:57 AM   #3
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Sigma 17-70 is worth extra $50...

QuoteOriginally posted by spesholized Quote
The question is, should I keep the sigma or get the pentax lens for $50 less? I heard the quality on the pentax is much better.
Don't think that 16-45 optically is much better or even better at all. Sigma 17-70 has very impressive for the price reviews (bot by pro reviewers and users). I have it in Canon mount and it's very good.

Assuming that optically, in AF noise/speed and in build both Pentax and Sigma are comparable look what you get with 17-70 for just $50 more:
  1. Extra 25mm tele range which's huge. You loose just 1mm on wide end.
  2. Faster f2.8-3.5 aperture throughout the whole common (17-45mm) range. Sigma gets to f4 only past 50mm.
  3. Very handy 1:2.3 (actually even better 1:2 on my copy) macro.
In my book it's very well worth it. In my experience 17-70 is very well built and AF is very fast though noisy (compared to Canon ultrasonic USM motors).

Btw, here're few 17-70 pro reviews:

Sigma AF 17-70mm f/2.8-4.5 DC macro - Photozone Test Report / Review

Sigma 17-70mm f/2.8-4.5 Macro DC review
12-29-2006, 02:11 PM   #4
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QuoteOriginally posted by klopus Quote
Don't think that 16-45 optically is much better or even better at all. Sigma 17-70 has very impressive for the price reviews (bot by pro reviewers and users). I have it in Canon mount and it's very good.

Assuming that optically, in AF noise/speed and in build both Pentax and Sigma are comparable look what you get with 17-70 for just $50 more:
  1. Extra 25mm tele range which's huge. You loose just 1mm on wide end.
  2. Faster f2.8-3.5 aperture throughout the whole common (17-45mm) range. Sigma gets to f4 only past 50mm.
  3. Very handy 1:2.3 (actually even better 1:2 on my copy) macro.
In my book it's very well worth it. In my experience 17-70 is very well built and AF is very fast though noisy (compared to Canon ultrasonic USM motors).

Btw, here're few 17-70 pro reviews:

Sigma AF 17-70mm f/2.8-4.5 DC macro - Photozone Test Report / Review

Sigma 17-70mm f/2.8-4.5 Macro DC review
exactly the reasons I got the 17-70. I wanted the extra zoom, and the macro, although not as good as a dedicated macro, is pretty impressive in my books.
so far I like it and it seems sharp, although I have to admit I have no other lenses to compare it to.

hattitidues

12-29-2006, 02:47 PM   #5
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[QUOTE]
  1. Extra 25mm tele range which's huge. You loose just 1mm on wide end.
  2. Faster f2.8-3.5 aperture throughout the whole common (17-45mm) range. Sigma gets to f4 only past 50mm.
  3. Very handy 1:2.3 (actually even better 1:2 on my copy) macro.

1mm at a very short FL is a bigger difference than it sounds.

How does the 16-45 f4 only get to f4 beyond 50mm?

Sigma apparently only recenlty came out with the macro version of my shorter 18-50. I missed it in the shopping list :-(
12-29-2006, 03:27 PM   #6
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QuoteOriginally posted by SpecialK Quote
1mm at a very short FL is a bigger difference than it sounds.
True to extent. But still in trems of real field of view coverage 25mm extra on tele is substantially more.

QuoteOriginally posted by SpecialK Quote
How does the 16-45 f4 only get to f4 beyond 50mm?
What I was saying is that within common between both lens 17-45mm range Pentax's fastest aperture is f4 while for Sigma it's f2.8-3.5 which's whole 2 stops faster up to 23mm and 1 to 1/2 stop faster after that. More low light handholding and more control over shallow DOF.

QuoteOriginally posted by SpecialK Quote
Sigma apparently only recenlty came out with the macro version of my shorter 18-50. I missed it in the shopping list :-(
I had the older non-Macro version and optically and in build (depite being EX lens) it's on par with 17-70.
12-29-2006, 07:01 PM   #7
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guess the sigma is keeper

thanks for the replies guys
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