Via Lens Rentals
Roger Cicala from has posted his first resolution tests of the Canon EF 24-70 f/4L IS.

He has compared it with the EF 24-70 f/2.8L version 1 and 2, the EF 24-105 f/4L IS as well as the Tamron 24-70 f/2.8VC. All of which will probably get your consideration in a very crowded focal range.

At 24mm, the EF 24-70 f/4L IS is the second best performing lens behind the EF 24-70 f/2.8L II. Mind you, the results are all pretty close. It does look like Canon's MTF chart of the lens holds up against the others.

ef2470f4is24chart1 - EF 24-70 f/4L IS Resolution Tests
EF 24-70 f/4L IS at 24mm Resolution Comparison Chart

At 70mm, none of the lenses are as sharp as they are at 24mm. However, the EF 24-70 f/4L IS is again the 2nd best performing lens by a small amount.

ef2470f4is70chart1 - EF 24-70 f/4L IS Resolution Tests
EF 24-70 f/4L IS at 70mm Resolution Comparison Chart

Part of Roger's Conclusion
Obviously this hasn’t told us a thing about autofocus accuracy, bokeh, or a dozen other things that have to be considered when choosing a lens. Just like you, I’ll be waiting for more complete reviews to tell us about that.

On the basis of this information, though, I’m . . . well, I don’t know what I am. This is a good lens, but I at the price point I’d probably prefer the f/2.8 of the Tamron VC to the new Canon’s f/4. The macro feature is nice and will certainly pull some people towards the Canon.”

Roger also notes that there was quite a bit of variation at 70mm between the 22 copies they tested.

Read the entire articleCanon EF 24-70 f/4L IS at B&H Photo $1499



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