For those of you that don't know I recently did a detailed review comparing samples, charts and video for the AF speed. This review can be found here:
Tamron 70-200 2.8 VC vs Sigma 70-200 2.8 OS
Many have asked about the Tamron vs the Canon F4 IS since they are similarly priced (+/-$100ish). Well I won't go into the detailed review like I did with the Sigma but I will post up the data. My neighbor had bought my 70-200 F4 IS about 1.5 years ago so she let me borrow it tonight. I had about 20 minutes with what available light I had left to do this so I did the best I could. Same setup as before with 2 second delay, mirror lockup, tripod mounted, manual focus, live view w/ 10x. everything I can do to eliminate any user error. ADDED INFO: All images were simple import into LR4.3 with standard settings and then screenshots were taken with the side by sides. Also, there are UV filters on both lenses but where REMOVED for the test shots. I forgot to put that in there because I had put them back on when I took the photo of the lenses side by side with my phone.
With that being said lets look at the results:
AF SPEED
Look at this YouTube video Here![]()
They are so very close when looking through the viewfinder it's rather hard to see any difference. I could assume the Canon tracks better in Servo but I simply did not do any testing at all so cannot comment.
(REMEMBER: all crops on left is Tamron and all crops on right are Canon)
ALL IMAGES ARE @ F4
70MM SCENE
100% CROP CENTER
100% CROP MIDRANGE
100% CROP CORNER
200MM SCENE
100% CROP CENTER
100% CROP MIDRANGE
100% CROP CORNER













