Archived posting to the Leica Users Group, 1999/12/18
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]Frank Dernie wrote: SNIP -- I for one am fascinated. I knew that the prisms gave the rangefinder effect of around 0,18 times focal length. Olympus and Nikon and probably others made f4 focussing screens which increase accuracy to 0,2 x focal length .... I had always rather assumed that SLR split images were WAY less accurate than a Leica. My SLR has a plain ground glass, I prefer it personally and assumed it to be more accurate for the reasons mentioned. SNIP -- Similar to Frank Dernie, and probably many others, I also use a uniform ground glass sereen, but with a grid division for focusing with my Rs. Why does the split prism focusing aid in the universal screen, black out when using longer lenses? Sorry, this probably has been explained to me before. However, in the early fog of Saturday morning, I cannot remember why the split prism focusing aid on the universal screen blacks out at longer focal lengths (unless your eye is re-positioned at the eye cup correctly). Mary, where is that coffee? Bill Caldwell Northern Virginia <sneeker@erols.com>