Archived posting to the Leica Users Group, 2003/08/20
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]In a message dated 8/20/03 9:29:38 AM Pacific Daylight Time, henningw@archiphoto.com writes: > Since even film is not completely analogue (film grain), lenses are > not perfect and output media have their own limitations on > definition, and we view the output with our own optical limitations, > we start defining a circle of confusion that quantifies what we > gather into a 'zone of focus' under certain shooting conditions. - ---------------- That's about what I meant if I didn't express it well. - ---------------- <<Digital takes that one step further; at one certain distance, the 'true focus distance', a point object is imaged as a single pixel. Then, you have to be a definite distance off the 'true focus distance' before the point is no longer imaged as a single pixel, but as four pixels. That is digitisation, and it means that you have to be a certain distance off the true focus before you can dectect _any_ loss of focus.>> - ------------------------ Then I would suppose that a good CMOS sensor would react more like a grain in film. Therefore, the CMOS pixel would provide much sharper images. That could be Foveon's strong point. And Foveon has made that claim, since a Foveon sensor is arranged in depth, like color-sensitive layers in a color film. br - -- To unsubscribe, see http://mejac.palo-alto.ca.us/leica-users/unsub.html