BengtS

Based on PZ, I also bought  the 55 250. My findings are similar to yours. The pictures looked flat. For that reason, I returned it. If that was just coincidence, I dont know.

The test i am referring to was for the Version I and was published in the German Magazine "Fotomagazin" in 2005. I think it was the February or March issue. "Fotomagazin" is a very respected...

I used to have the Tokina 12-24 F4 but I sold it as I bought the Sigma 8-16, even though I was very happy with it. The main reason for selling it was that i thought I did not need that range. It...

John, I find it pretty arrogant of you to say that everybody's claim here is nonsense except yours!I have taken some 30k shots with my 7D and I know its every move. I have also belonged to the...

And so I did ;-)I do not really do any serious photography of fast moving objects, so the experts out there will probably get much better results than I did. That said, I did the following:The...

I added the values to the original answer....85F1.8 : Was/Is: -6 50F1.8 : Was/Is: -11Sorry for the confusion.

This is exactly what i have seen too. This problem was gone with new firmware.

Changes to MF35F2.0 Was -10, Now: -2 70-210 F3.5-4-5 Was 7, Now 0No changes to MF85F1.8 50F1.8

Please check if the problems you describe in your remark some 5 Months ago are now resolved. http://forums.dpreview.com/forums/read.asp?forum=1019&message=40908127 The reason I ask, is that I have...

I have upgraded to 2.0 and yes there are changes.MFA is different, but only on some Canon lenses. In one case, the MFA went from -10 to -2, in another case the MFA went from +7 to 0. My other two...

Hm. To my knowledge, Canon has never licensed anyone anything related to the EF mount.I have upgraded my 7D firmware to version 2 and have not experienced any incompatibilities so far with my Sigma...

Just updated to firmware v2. Here are my first impressions:After updating, it seems that the AF system is working differently compared version 1.2.5. I used to have to focus twice to be sure to get...

The issue with focusing problems is real. I own a 7D. It is not a question of user error, but of repeatability and reliability of the focusing system.
If I have time, I focus twice in one shot...