I’ve been shooting down at f/16-f/22 a lot over the last few months and noticed a debatable slip in sharpness on a lot of my images. It’s very slight if at all and gets corrected in post production so it’s not a really big deal. However, I did find a sweet little video from the guys at Fstoppers explaining this phenomenon known as diffraction.
This concept of diffraction falls in a similar vein to that of the Modular Transfer Function of a lens and is absolutely something to be thinking about when picking your f/stop next time you’re out shooting. If you’ve ever heard someone talk about the “sweet spot” of a lens they are probably referring to the f/stop that allows for the most sharpness before diffraction occurs.
Here’s the video: