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+--- Thread: next PZ Lens Test Report: Sigma AF 17-50mm f/2.8 EX DC HSM OS (/showthread.php?tid=3822)
next PZ Lens Test Report: Sigma AF 17-50mm f/2.8 EX DC HSM OS - Klaus - 07-01-2010
[url="http://www.opticallimits.com/canon-eos/531-sigma1750f28os"]http://www.opticallimits.com/canon-eos/531-sigma1750f28os[/url]
Quite impressive actually.
FWIW, this lens was purchased just for these tests and is now available for sale (540EUR + shipping).
next PZ Lens Test Report: Sigma AF 17-50mm f/2.8 EX DC HSM OS - Guest - 07-01-2010
[quote name='Klaus' date='01 July 2010 - 09:32 PM' timestamp='1278016326' post='791']
[url="http://www.opticallimits.com/canon-eos/531-sigma1750f28os"]http://www.opticallimits.com/canon-eos/531-sigma1750f28os[/url]
Quite impressive actually.
FWIW, this lens was purchased just for these tests and is now available for sale (540EUR + shipping).
[/quote]
In the conclusion you state it is best in class; does this mean you think it out performs the canon 17-55? (It is less expensive but lack IS and FTM; not sure if it is better built).
next PZ Lens Test Report: Sigma AF 17-50mm f/2.8 EX DC HSM OS - Klaus - 07-01-2010
[quote name='you2' date='01 July 2010 - 10:40 PM' timestamp='1278016813' post='792']
In the conclusion you state it is best in class; does this mean you think it out performs the canon 17-55? (It is less expensive but lack IS and FTM; not sure if it is better built).
[/quote]
Where do I state that ?
" starting at f/4 it beats or at least matches alternative products including the more expensive Canon EF-S 17-55m f/2.8 USM IS"
So obviously it does not beat it at f/2.8.
And the Sigma has an IS (OS) of course. The build quality is "different" compared to the Canon - more "tight" but less sophisticated.
next PZ Lens Test Report: Sigma AF 17-50mm f/2.8 EX DC HSM OS - Guest - 07-01-2010
My fault -- read "Sigma's best product in this class so far." as "best product in this class so far ". Please forgive me.
I should take a nap.
[quote name='Klaus' date='01 July 2010 - 09:51 PM' timestamp='1278017513' post='793']
Where do I state that ?
" starting at f/4 it beats or at least matches alternative products including the more expensive Canon EF-S 17-55m f/2.8 USM IS"
So obviously it does not beat it at f/2.8.
And the Sigma has an IS (OS) of course. The build quality is "different" compared to the Canon - more "tight" but less sophisticated.
[/quote]
next PZ Lens Test Report: Sigma AF 17-50mm f/2.8 EX DC HSM OS - miro - 07-02-2010
Thanks for the nice review.
I’m happy that I this review is included some AF properties like – rotating angle, MF focus capability etc.
Klaus what is your experience with this lens. How it compares to the old Tamron 17-50/2,8.
next PZ Lens Test Report: Sigma AF 17-50mm f/2.8 EX DC HSM OS - Klaus - 07-02-2010
[quote name='miro' date='02 July 2010 - 09:23 AM' timestamp='1278055383' post='797']
Thanks for the nice review.
I’m happy that I this review is included some AF properties like – rotating angle, MF focus capability etc.
Klaus what is your experience with this lens. How it compares to the old Tamron 17-50/2,8.
[/quote]
The old Tamron had some hefty field curvature issues so despite the better chart figures at 17mm @ f/2.8 there's no real world advantage for the Tammy at this setting. I think the Sigma is better at 17mm f/4 and the Tammy requires f/5.6 to catch up again. The Tammy has more CAs so its subjective quality perception may be somewhat lower as well here (unless you correct the issue). The Tammy has a tad less barrel distortion at 17mm.
Personally I'm not a fan of the Tamron build quality nor style - Sigma is better here. However, the Tammy non-VC is a lot cheaper.
So they're darn close - just like their ratings indicate. :-)
next PZ Lens Test Report: Sigma AF 17-50mm f/2.8 EX DC HSM OS - Guest - 07-02-2010
Surely a very nice lens, soft corner at f2.8 isn't really field relevant, I mean who shoot 2.8 to in order to get everything sharp?
next PZ Lens Test Report: Sigma AF 17-50mm f/2.8 EX DC HSM OS - Guest - 07-02-2010
Where are border and extreme exactly in the frame?
next PZ Lens Test Report: Sigma AF 17-50mm f/2.8 EX DC HSM OS - mst - 07-02-2010
[quote name='Rasho' date='02 July 2010 - 11:44 AM' timestamp='1278067487' post='802']
Where are border and extreme exactly in the frame?
[/quote]
There's an illustration in our Lens Test FAQ:
http://www.opticallimits.com/Reviews/lens-test-faq
-- Markus
next PZ Lens Test Report: Sigma AF 17-50mm f/2.8 EX DC HSM OS - Guest - 07-02-2010
Aha, I figured that extreme borders are mostly irrelevant, zhat can-t be said for borders