Is That Lens Sharp In The Corners? No? Are You Sure? | Dennis A. Mook

Often I hear photographers and reviewers remarking that a certain lens is not sharp in the corners. But is it really not sharp?  Or maybe what you are seeing is the result of a curved field lens being tested against a flat subject.  I wrote about curved field lenses versus flat field lenses with some illustrations on the difference here..  If you are interested, please follow the link and read it.Here is a practical example of what I mean.  The image above was made using the highly touted Fujifilm 23mm f/1.4 XF lens.  The lens is very sharp, even wide open and contains an aspherical element.  I used it to demonstrate that, looking at the image above, one may wrongly conclude that the lens is not sharp in the corners……

Source: www.thewanderinglensman.com

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