Henry Posner/B&H Photo-Video wrote: > > I quote from two different threads because the topic is now related. The > human eye uses contrast to discern sharpness. A finder screen that provides > a brighter image may do so at the expense of contrast. If so the end result > will be a screen so bright you have to wear shades, but one which actually > provides less data on image sharpness. This was a criticism of the original > Olympus OM-1 which was introduced with much bragging about the camera's > small size and the brightness of its finders, and of some after-market > focus screens.
Absolutely! Bright screens are brighter because they let more light pass directly. So the finder image is partly a virtual image with those screens. The eye can always focus this part of the image, so the difference between "almost focused" and "focused" is rather small with those screens. They lack the "snap" of the screens used in some good manual focus cameras. Try focusing an EF 20mm f/2.8 manually with an average EOS camera. Good luck! Thomas Bantel * **** ******* *********************************************************** * For list instructions, including unsubscribe, see: * http://www.a1.nl/phomepag/markerink/eos_list.htm ***********************************************************
