I've read some reviews on this lens and some people are throwing around the term 'very sharp'. I have the G2 Tamron 150-600 version and it's definitely not as sharp as my Canon 100-400 II, so I didn't really believe the reviews' claims. However, I was curious so I figured I could return it if I wasn't satisfied. Well, I have to give credit to Tamron for this lens. It's very sharp, approaching the sharpness of my Pentax K-70 and the new 55-300 combo (the K-70 has no low-pass filter and these two options offer the sharpest setting I've ever used). The depth of field is both a blessing and a curse, it's razor thin at these focal lengths so I need some practice but it's not the lens. It's quite heavy, almost like a 100-400, so it takes some getting used to. Autofocus is very fast and almost silent, although perhaps not as fast as Canon lenses. The manual override is a very nice feature, and the focus ring is buttery smooth. The zoom ring isn't as pretty, but it still works. I have a 7D Mark II and I realized that due to its low pass filter and other factors I simply put up with its less than amazingly harsh output. But with this lens I was wrong and now I know that the 7D can actually take very sharp pictures. I haven't tried any of the Canon 70-200 versions, and I've only tried the Sigma version for a short time (although it seemed pretty harsh), but if you're looking for a 70-200 and your budget L glass won't admit it, Tamron is a great alternative.
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