Corner tests for 16-35 f/4 vs. 16-35 f/2.8 (v.1) vs. 24-70 f/2.8L II

Started Jul 4, 2014 | Discussions thread
OP hotdog321 Forum Pro • Posts: 19,004
Re: Love note to the nit pickers.

Abu Mahendra wrote:

Sure, but if so, then one will want to shoot the test images by i.) focusing at the hyperfocal distance and ii.) frame the image so that none of the out-of-focus area in front of the focus point is in the frame. Otherwise, you will be getting unsharp sections at the edges/corners for which you know not whether they are unsharp because the lens does not resolve sufficiently there or because the DoF did not extend that far.

By focusing in the corner and then examining at the corner you disentangle these DoF complications and you establish a baseline maximum resolution of the lens. By focusing on and then examining the corner, you establish best-case. It's never going to be better than that. That's as good as it's going to get because when you start focusing at points other than the corner, you start battling DoF.

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"That which is asserted without evidence can be dismissed without evidence."
The onus of the evidence is on the one making the claim, not on the one questioning the claim.

Who the heck shoots that way? The most I ever do is focus 1/3 into the scene and stop down if I want to maximize DOF.

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Canon EOS 5D Mark IV Canon EF 100mm f/2.8 Macro USM Canon EF 70-200mm f/2.8L IS II USM Canon EF 24-70mm f/2.8L II USM Canon EF 16-35mm F4L IS USM +3 more
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