Archived posting to the Leica Users Group, 2005/01/10
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]In the case of a reflex camera, a recent one at least, where focussing is carried out at max aperture any focus shift with aperture would cause the lens to be out of focus at smaller apertures. On 10 Jan, 2005, at 21:04, Jacques Bilinski wrote: > >> a mechanism to correction >> for focus shift with aperture, which would require some sort of >> linkage >> between the aperture ring and the focus ring - not something I have >> heard of before. >> > I've never heard of this either, but on an AF camera like the Nikon or > EOS > it would not be too difficult as the camera is doing the foccusing and > already knows the f stop and the distance. A lens with a lot of focus > shift > implies a loss of sharpness at wide aperatures as all the light rays > present > at small aperature are also present at a wide aperature and would be > focussed at a different distance. > > > _______________________________________________ > Leica Users Group. > See http://leica-users.org/mailman/listinfo/lug for more information >