If you want the sharpest pictures that your lens can give you, remember not to use its largest and smallest apertures. Most lenses are optimised to be used in the f/5.6 – f/11 aperture range and give their best performance when stopped down a couple of f-stops from the widest aperture or opened up from the smallest aperture.
What is Diffraction?
Large apertures are great for low-light, but unless you have an exceptional, lens it’s just too difficult to produce lenses that are razor-sharp at their widest aperture.
Marvels of science, that’s what they are, but they can’t escape physics, and diffraction is very real…
Remember to watch out for its effects when photographing at f/16 or smaller.
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Published: August 13, 2007 | Last Updated: July 23, 2021