Most helpful critical review
159 of 182 people found the following review helpful
A wolf in sheeps clothing!
on September 16, 2009
I have owned this lens since November and have taken 1000 plus pics with it. 25% of them are out of focus! I have used it on a 40D, XTI and 50D. I have been shooting middle school sports for 8 years and used a 70-200 f4l, 70-300IS, 85 1.8, and a Tamron 28-75 2.8. All focus much faster and more accurately. All the glowing reviews you read from most users are true, if the image is in focus, The image quality is great. But just like ALL professional review sites point out, this lens mis-focuses much to often for critical once in a lifetime shots. If you cant check your shot and reshoot if needed, do not use this lens. I got this lens to replace the F4L and there is no way I can do that. If the IQ of the 7D at high ISO 3200-6400 are any good I will sell this lens and get that and not need 2.8 for low light any longer.
Here is a quote from the most popular photo website in the world, During testing of this lens.
One problem we encountered with this lens in real-world shooting was a higher than expected proportion of slightly defocused images, especially visible when shooting at F2.8 where the depth of field can be extremely shallow. This was not a systematic 'front-focus' or 'back-focus' problem, but instead an apparently random tendency to miss focus slightly in situations for which we would normally expect a 100% hit rate. This issue persisted across a variety of camera bodies, from the EOS 450D through to the EOS-1D Mark III, so we can only conclude that it is a problem with the lens itself.
Good luck with your purchase.