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| p.3 #3 · Canon EF 24-70mm f/4L IS reviewed at Photozone |
If the vignetting really doesn't go away at 24mm no matter how much you stop down I would consider that a serious problem for landscape.
All lenses in this category vignette to at least some extent, yet all can work as landscape lenses. I shoot a lot of landscape subjects using the 24-105 (since the lens was first introduced) and the 24-70 v.2 (a few months) and I don't find vignetting to be much of an issue.
1. In the majority of photographs you don't even notice it and no correction is necessary.
2. Since it is most apparent at the largest apertures, and much landscape is done at smaller apertures, you'll rarely if ever see the worst case amount of vignetting.
3. Sometimes (more often than you might expect) a bit of vignetting can enhance the photograph. (It is a long story that I won't recite here, but often photographers actually burn down the edges and corners in post.)
4. The vignetting is easily eliminated (in most cases automatically, if that is your choice) in post when using software that includes lens profiles.
I think I do get the value proposition of the 24-70. Compared to the 24-70 f/2.8 it is less expensive, and that probably makes in appealing to some who associate the 24-70 focal length with "pro" lenses. It does provide a welcome and useful close-focusing ability. The IS gives it one advantage - for at least some photographers - over the 24-70 f/2.8. Its smaller size/bulk is valuable to a number of photographers.
However, I still have a hard time seeing its value overall against the other two existing 24mm-whatever L zooms. Few who believe they would want the 24-70 f/2.8 L will be willing to go with this lens instead, aside from a few who primarily want the IS and the close focusing. Few who rely on the 24-105 will want to give up the 70-105mm focal length range, and few will find any real world improvement in their photographs related to differences in optical performance.
I feel like the f/4 24-70 looks like a fine lens - well designed and with a fine feature set for some photographers. The problem, at least right now, seems to me that the arguable advantages that it might offer will likely seem compelling to only a small number of photographers when the 24-70 f/2.8 and the 24-105 f/4 IS are the alternatives.