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You Get What You Pay For - But that may be OK.
on June 28, 2013
I'll start with the bottom line: This is a decent telephoto for an amateur on a budget. If you're not going to pay for a 70-200 L-series, this is where you're likely to end up. And as long as you don't move up to "serious amateur" status, you'll be happy.
The main problem I have is that it is not sharp. I ran a series of tests, taking pictures of newspaper and comparing the results to the other lenses I have. Image quality was clearly inferior to the EF 50mm f/1.8 II (about $100) and the EF-S 18-135mm STM kit lens that came with my 650D.
Another issue is the quality of the IS. The IS works, but in my tests, it's picture clarity due to camera shake was clearly inferior to my kit lens. This was for the same shot, same zoom level (135mm), and other conditions held constant for both lenses.
One thing to note: resale value. Look at the numbers on Amazon for used items compared to new ones. The good lenses hold their values very well, but this one does not. So if you decide to sell it for an upgrade, you may be (like me) disappointed.