16-35 f4: Mostly likely cause of soft Left & Right Edges?

Started 3 months ago | Questions thread
OP nkistrup Senior Member • Posts: 2,561
Re: 16-35 f4, in Infrared vs. Sony 10-18 f4 in visible light

Igor Sotelo wrote:

nkistrup wrote:

Agreed that wide lengths will suffer more from edge softness. But still think the Canon 16-35 should be doing better.

Took a photo w. the Canon @ f11, vs. f8 for the Sony (DoF should be the same); Canon shot at 16mm, Sony at 11mm, which should be close. Here are the results:

Sony 10-18 f4

Canon 16-35 f4

In both cases, cropped the lower right 1200x1200.

Canon is definitely softer. So back to my original question: Is the Canon lens a poor copy, or Does it suffer from softer edges in infrared?

Lenses for APS-C are smaller and less expensive to make and easier to make sharp at the edges.

Fair enough.

The trade of using cropped sensors however, is lower high iso performance, and a stop less of subject isolation compared to FX.

Thanks Igor, but actually accounted for the DoF in my test shots: Sony photo was taken at f8, while the Canon photo was taken at f11.  (New to FF, struggle with difference.)

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