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04-02-2013, 06:13 PM   #1
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New Sigma 17-70

Anybody have any first hand experience with the new Sigma 17-70 that is made of a "composite" material? It appears to me to be optically similar to the old ones, but is marketed as part of their new series of lenses.

Dale

04-02-2013, 06:42 PM   #2
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I don't have one but here is a review of it (if you have not seen it yet):
Sigma C 17-70 mm f/2.8-4.0 DC Macro OS HSM review - Introduction - Lenstip.com
04-02-2013, 07:24 PM   #3
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Yes, I've read several reviews. I was wondering if anyone on here had any personal experience with one.

This is a good review you referenced, I guess hadn't read that one. Thanks Jonathan!

Last edited by hoagie; 04-02-2013 at 07:39 PM.
04-02-2013, 07:57 PM   #4
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QuoteOriginally posted by hoagie Quote
Yes, I've read several reviews. I was wondering if anyone on here had any personal experience with one.

This is a good review you referenced, I guess hadn't read that one. Thanks Jonathan!
It isn't available in K mount yet.

04-02-2013, 08:41 PM   #5
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Being new to the Pentax stable, I guess I hadn't realized that that Pentax has its own 17-70 that appears to be decent. I may research that one a bit. I also didn't realize that the Sigma didn't come in a K mount yet.
04-02-2013, 09:09 PM   #6
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04-03-2013, 04:49 AM   #7
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QuoteOriginally posted by hoagie Quote
It appears to me to be optically similar to the old ones
No it's different.

QuoteOriginally posted by hoagie Quote
I guess I hadn't realized that that Pentax has its own 17-70 that appears to be decent
I wrote the review of two Sigma and one Pentax 17-70 here at Pentaxforums. The Pentax is more than decent, to be sure, but I prefered the Sigma lenses, in particular version 1.
04-03-2013, 02:42 PM   #8
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QuoteOriginally posted by bdery Quote
No it's different.



I wrote the review of two Sigma and one Pentax 17-70 here at Pentaxforums. The Pentax is more than decent, to be sure, but I prefered the Sigma lenses, in particular version 1.
Yes, I see now that the new one has some fluorite type elements and a different configuration. Does Sigma, by chance make the Pentax lens?

04-04-2013, 05:14 AM   #9
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QuoteOriginally posted by hoagie Quote
Yes, I see now that the new one has some fluorite type elements and a different configuration. Does Sigma, by chance make the Pentax lens?
No, they do not. Pentax designed their own lenses, and if you look at the specs, you will see that they are quite different. You must looke beyond the focal length to compare lenses. The aperture, magnification, number of lens elements, even the filter sizes are different.
04-04-2013, 03:20 PM   #10
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QuoteOriginally posted by bdery Quote
No, they do not. Pentax designed their own lenses, and if you look at the specs, you will see that they are quite different. You must looke beyond the focal length to compare lenses. The aperture, magnification, number of lens elements, even the filter sizes are different.
I understand the physical differences. I am wondering if Pentax (Ricoh?) manufactures their own lenses, or if they farm it out to other manufacturers such as Tamron or Sigma etc. who would make it to Pentax's specs. Just curious, as I know Sony makes CMOS image sensors for several different brands and yes, they may be different, but are still manufactured by Sony to the specs of each respective brand.
04-05-2013, 04:41 AM   #11
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QuoteOriginally posted by hoagie Quote
I understand the physical differences. I am wondering if Pentax (Ricoh?) manufactures their own lenses, or if they farm it out to other manufacturers such as Tamron or Sigma etc. who would make it to Pentax's specs. Just curious, as I know Sony makes CMOS image sensors for several different brands and yes, they may be different, but are still manufactured by Sony to the specs of each respective brand.
You are correct that Sony makes the sensors for many cameras. However, Pentax has always made their own lenses, with their own factories.
04-05-2013, 08:50 AM   #12
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QuoteOriginally posted by bdery Quote
You are correct that Sony makes the sensors for many cameras. However, Pentax has always made their own lenses, with their own factories.
Thanks for the info....
04-16-2013, 05:20 AM   #13
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Any word on this lens yet? I'm in need of a lens to replace my DA17-70, which has developed some AF issues (though its sharpness is superb).

The pricing on the new Sigma 17-70 seems odd, since the pre-order price on the K-mount version is $100 less than for the well-regarded 17-50/2.8. One does get F/2.8 at 50mm on the shorter version (F/4 kicks in at 50mm on the 17-70 according to Lenstip). However, it seems odd that one gets 20mm more reach for $100 less.
04-16-2013, 09:13 AM   #14
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QuoteOriginally posted by GeneV Quote
However, it seems odd that one gets 20mm more reach for $100 less.
I have to imagine it's because having a constant f/2.8 aperture throughout the range from 17-50 costs more to produce than a variable 2.8-4 aperture from 17-70. but that's just a guess. the 17-50 is significantly larger in size and weight compared to the 17-70.
04-16-2013, 09:18 AM   #15
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Gene,

Here are some early reviews of the lens, albeit for other mounts.
-Brian

Fstoppers Reviews the Sigma 17-70mm f/2.8-4 Contemporary Lens | Fstoppers

Sigma C 17-70 mm f/2.8-4.0 DC Macro OS HSM review - Introduction - Lenstip.com

Unexpected Access with Sigma 17-70mm 2013 Edition | Shutter Journey (SGP)
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