Installing Focusing/Fresnel Screens | Digital SLR | Film SLR Cameras Canon | Fuji | Konica | Minolta | Olympus | Pentax | Sony | Single Lens Reflex Cameras Installing Focusing or Fresnel Screens In this article, I will reference the Fresnel lens or focusing screen as the “screen”. Most SLR users know this but I have talked to many customers over the years who didn’t, so I am going to say… when using a digital or film camera SLR, none of the spots, Read More...