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from Toronto on 2/12/2010
Comments about Tamron Tamron SP AF 1.4x PRO Teleconverter for Canon EOS - U.S.A. Warranty:
My opinions of this extender are something of a mixed bag. Optically, I think the 1.4x extender is quite good and is a useful addition to my bag. IS functionality is retained on all the lenses I tried.
On the other hand, I'm disappointed autofocus fails in many of my lenses. Specifically, 50mm f/1.4, 100 mm f2.8L IS Macro, 200mm f/2.8L all hunt for focus even when they are wide open. The hunting seems to continue indefinitely.
Manual focus works fine and the camera detects critical focus being achieved.
Rather bizarrely, autofocusing my 17-40mm f/4L works fine - even though it should not. Go figure.
Something else that's odd - the model in the photograph is off-white. Mine is black. Maybe that matters, maybe not.
[4 of 4 customers found this review helpful]
Comments about Tamron Tamron SP AF 1.4x PRO Teleconverter for Canon EOS - U.S.A. Warranty:
This is the most versitile addition you can add to your bag. It fits the largest variety of lenses, while maintaining auto functions using lenses up to f/5.6 without problem. I use it on a Canon EF100-300 f/5.6L, Canon EF 400L and Canon EF100 2.8 USM macro without noticable loss of detail. It is suggested when using with macro lenses, to use manual focus which is common at high magnifications anyway. Considering the price of long glass, it's the best bang for the buck around! Get it, you'll be glad you did.