In this Foundation Concept video Craig looks at the optical aberration of diffraction and how it relates to aperture and f-stop and discusses the following :

 

- a lay person’s definition of diffraction

 

- what is an f-stop

 

- a lens resolution chart showing the sharpness and contrast at different apertures

 

- what are the possible implications of the competing ideas of diffraction and stopping down to get greater depth of field

 

- link to technical definition and description of diffraction