FEATURED WEB TUTORIAL: DIFFRACTION
Understanding Diffraction: Pixel Size, Aperture, and Airy Disks
Published by: CambridgeinColour
Diffraction is an optical effect which can limit the total resolution of your photography-- no matter how many megapixels your camera may have. Ordinarily light travels in straight lines through uniform air, however it begins to disperse or "diffract" when squeezed through a small hole (such as your camera's aperture). This effect is normally negligible, but increases for very small apertures. ...