How to see diffraction in photos

Started 4 months ago | Discussions thread
Jeff Wahaus Contributing Member • Posts: 917
Re: How to see diffraction in photos

Dann-Oh wrote:

Hello all,

I am wondering if you guys could help me understand what diffraction is and how to spot it in my photos?

I was trying out my new flash and I was trying to get a black background, so I stopped down to f16.

If you look at a lens sharpness test chart for just about any lens you'll notice most lenses are sharpest at around f/5.6 (super telephoto lenses excluded).  I wouldn't choose this aperture if you need more depth of field as you're trading a little more sharpness at the focus point for less sharpness in front of and behind the focus point.  It really depends on the subject matter as to what aperture is best.

The slight softness you get from a non-optimal aperture is easily corrected with post processing in most cases.

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