A relatively new trend has emerged in the online photography communities over the last few years that involves shooting into the sun or other bright light sources so that the bright light creates star points around it. Also known as sunstars.
I run across a lot of tutorials and tips of people explaining how to do it. Typical they all say about the same thing, shoot high apertures, anywhere from f16 to f22.
While this does usually work, it's not always the best practice. I find that shooting at higher apertures on many of our high megapixel cameras has a massive impact on overall image quality due to diffraction.
So what do we do?