Scott Murray posted a link to a site, in another thread about lens groups and elements, and I have been there reading ever since I clicked on that link. Thanks a lot Scott!! I have been wayyyy sidetracked here!
Anyway, I ran across something that I sure never knew and had not even considered, however, something that I have certainly experienced.
This article is about sensor pixel size, how some sensors now have photosites only twice as wide as the wavelength of the light it records, how the image is affected by how the light hits the sensor etc.
Here is a point I found very interesting and may explain the issues when using DX lenses at smallest apertures:
Anyway, I ran across something that I sure never knew and had not even considered, however, something that I have certainly experienced.
This article is about sensor pixel size, how some sensors now have photosites only twice as wide as the wavelength of the light it records, how the image is affected by how the light hits the sensor etc.
Here is a point I found very interesting and may explain the issues when using DX lenses at smallest apertures:
Bob Johnson - Earthbound Light said:. . . . . It would seem at some point there must therefore be a limit [to how small a photosite can become (SIC)]. At least by the point that the photosite's shrink to be smaller than the wavelength of visible light, multiple pixels must be recording the same thing as their neighbors.
But it gets worse yet.
Diffraction becomes increasing a factor with smaller sensors. This is why lens on my Galaxy Note 3 is only f/2.2 whereas the typical DSLR goes all the way down to f/22. If light is bent (diffracted) by even a small amount from its original path it will fall on a different photosite and thus get tallied as part of the wrong pixel. Sharp images require that we avoid the effects of diffraction.
Even with a DX (APS-C) sensor camera, diffraction will begin to soften images beyond f/16 despite the fact your lenses may go to f/22.
Copyright © 2013 Bob Johnson, Earthbound Light - all rights reserved.
Just How Big is a Pixel? - Photo Tips @ Earthbound Light