fStopJojo's 24-70EX vs. Mine vs. 70-200L

Started Oct 30, 2005 | Discussions thread
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lwestfall Regular Member • Posts: 309
fStopJojo's 24-70EX vs. Mine vs. 70-200L

Check out the completely unprocessed 100% crops here: http://www.pbase.com/lwestfall/image/51076066

OK, technically both the 24-70EX's are mine, as I was the lucky one who won fStopJojo's crazy eBay auction of his "24-70L-killer" a few weeks ago. Now I'm finally getting around to posting some 100% crops corroborating fStopJojo's findings of the lens's excellent sharpness even wide open at f/2.8. In my little shootout I compared it to my extremely sharp 70-200/2.8L non-IS so you can see how close it comes to the sharpest zoom Canon's ever made. (To see what I'm basing that last part on, just go here: http://forums.dpreview.com/forums/read.asp?forum=1029&message=15569653 )

The 24-70EX that I had originally bought new many months ago is considerably softer, especially wide open and in the long end of its focal length range (@24mm at at all apertures, the two Sigmas are identical). I wasn't very impressed with it when I tested it against the 18-55, 28-80, and 50/1.8 lenses soon after purchasing it. You can see that old shootout here: http://www.pbase.com/lwestfall/image/51393697

So this makes me wonder now: Which of these 24-70EX samples is a typical, average copy of the 24-70EX DG Macro??? It would be a shame if the soft one is.

I have sent this soft Sigma in to Sigma USA Service in Ronkonkoma, NY twice already, asking them to fix the long-end softness, along with other issues (front-focusing AF and MF lockups, both of which they did fix), but all they ever did was tell me it looks sharp to them (but their only test shot was at 24mm f/2.8). This week I told my story to Sigma Japan (and shared the comparison with the 24-70EX from fStopJojo), they emailed me back immediately with this encouraging reply:

"We regret very much problem you have experienced with Sigma Corporation of America's service. Actually, Sigma America has very high service standards, but this time we were really upset that they could not give you a satisfactory service. Please send your lens to Japan through Sigma Corporation of America. Please also put copy of the correspondences and sample images. We are going to investigate this problem, we are going to repair your lens and if necessary replace it with a new product."

So hopefully I'll end up with another sharp 24-70EX that I can sell to one of you in another hot eBay auction. From Sigma Japan's response it sounds like the sharp 24-70EX is supposed to be the typical one. Who knows how sharp the average 24-70EX out there is though...

Cheers,
Lincoln

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