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Tamron 150-600MM F/5-6.3 DI VC USD

884479
Review Date: Mar 22, 2014 Recommend? no | Price paid: $1,200.00 | Rating: 6 

 
Pros: Presently best bang for your buck for a zoom lens in this focal range. Weight and size make it easy to handhold. Gives sharp images.
Cons:
Will not AF properly in AI Servo mode on many Canon bodies.

I was at first impressed with this lens until I tried it in the 500-600mm range in AI Servo mode on both my 7D and 1D4. It simply would not change focus when aimed at a distant subject then aimed at a nearer subject.

This problem occurred with "focus search" turned on, focus-limiter in either position, and in bright light with contrasty subjects.

As of March 22, I have not heard of this problem being either acknowledged or fixed by Tamron, despite a number of similar complaints on the Canon Forum.

Returned my copy for a refund.

May try the lens again if this problem is fixed or if it will work properly on a 70D.


 
Nikon 70-300mm f/4.5-5.6G IF-ED VR AF-S

70-300vr
Review Date: Feb 28, 2012 Recommend? yes | Price paid: Not Indicated | Rating: 8 

 
Pros: Good quality and bang for buck.
Cons:
Not being compatible with any TC is lame. Canon 100-400 works with TC's.



 
Tamron 200-500MM F/5-6.3 Di LD (IF)

200500mm
Review Date: Aug 9, 2007 Recommend? no | Price paid: Not Indicated | Rating: 5 

 
Pros: Nice zoom range, pretty sharp for the price, produces good colour and contrast.
Cons:
Poorly built, does not take TC's well, and no focus-limiter.

For anyone wanting a telephoto for birds in flight or action sports, do not buy one without a focus-limiter. The Tamron will start focusing at the point where it last was focused, go back to minimum focusing distance, and then back out to the subject. By the time this happens, the subject has usually gone. If you require fast AF, get a lens with a focus-limiter.

This lens was not even a year old, when two parts of the focusing mechanism came apart. They were held together by glue, and the glue failed. What kind of quality construction would rely solely on glue to hold two moving parts together?

The optical quality was quite good considering the price. Images with the 1.4X TC were soft, and with the 2X TC they were unacceptable. AF speed was terrible with either TC.

If you want a quality telephoto lens, go for the Canon 100-400. 100mm less range, but superior to the Tamron in all other respects. If you need the zoom 400-500 range, I would recommend the Sigma 50-500mm over the Tamron.