How to see diffraction in photos

Started 5 months ago | Discussions thread
Tom Axford Veteran Member • Posts: 9,834
Re: How to see diffraction in photos

JosephScha wrote:

Honestly, the only way to be sure you are seeing diffraction is if someone posts two pictures, one at f/4 or f/5.6; the other at f/11 or f/16. I don't think there are examples of that on this thread and possibly not on this forum. Maybe someone will give this a try.

In fact, very early in this thread I posted shots taken at f/8 and f/16 to show the difference.  They are shots of pieces of black text on a white background, so no doubt some people will say they are not "real" pictures!  But they clearly show the extra blurring at f/16.

However, it is very easy for anyone to do the experiment themselves.  Please do it!  It is the most convincing way to see the effects of diffraction.  Simply take two shots of your chosen subject, one at f/8 and the other at f/16 (or f/22 if that is available).

Of course, you need to ensure that the shutter speeds are fast enough that you are not introducing blur through camera shake.  Also, make sure that your subject is not so close that depth of field is so small that it becomes a problem to get the subject in focus.

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