jd7 said:Larsskv said:I own both the 24-70 f/2.8 L II and the 24-70 f/4 L. I use the f/4 when hiking, due to it's weight and size advantage.
On my Canon 6D, I find that the f/2.8 is sharper in the center part of the image on all focal lenghts, has better micro contrast and clarity. Further, it is sharper in the corners at 24 mm. However, be aware that these differences are quite small, and for the most it requires pixel peeping to see any difference. The biggest advantage of the f/2.8 is the quality of the bokeh, I think.
However, when it comes to sharpness, the f/4 is the more even performer. While the f/2.8 is great in the center at all focal lengths, and great across frame at 24mm, the f/4 has more even sharpness across frame at other focal lengths than 24 mm.
On my 7DII I think the f/2.8 the advantage in performance is bigger than on my 6D. The f/4 however, is still the more even performer when it comes to sharpness adross frame.
All in all, the f/4 is a great lens - especially for landscapes, where even sharpness across frame is important. I will keep the f/4 due to the even sharpness, size and weight. IS is always ok to have, but I really don't miss it that much With the f/2.8. I'm not much of a macro shooter, so I won't comment on that.
This is not the first time I have heard someone say the f/4L IS is more even across the frame than the 2.8L II. I have come across successful professional landscape photographers using the f/4L IS. I asked one why he used the f/4L IS rather than the 2.8, and his comment was the f/4L is sharper across the frame. I hesitate to post that because of how highly regarded the 2.8 is, and the fact I have little personal experience with the 2.8, but there it is for whatever it may be worth. Anyway, I certainly believe the 2.8L II is a fantastic lens (particularly for events, which I assume it was largely designed for), but I think the f/4L is a pretty good lens too (albeit I assume it was designed more for landscape than events).
I personally have not experienced this, and I have shot a bit with the f/4 version.
The one thing I will say, however, is that from my own experience, the f/2.8 II lens has massive copy variation. I went through five before I was satisfied. I think the QC on this lens isn't Canon's finest and that a lot of people merrily go on their way without noticing what's wrong. I've had copies with decentered elements, with the barrel creek, and one that didn't AF properly.
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