Archived posting to the Leica Users Group, 2001/02/10
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]Well, being mathematically impaired myself, I can't answer that linear part without some empirical testing. I have always _assumed_ that it was linear. I (think I) know that with respect to image magnification, it is indeed linear, i.e. a 150 focuses @ infinity at 150mm from the film plane and @ 1:1 at 300mm. Well I'm gonna go drag my camera out and do some focusin' and cypherin' ... I'll be back shan At 08:14 PM 2/11/01 +0100, Tim wrote: > > then > > placing the lens exactly between these two points per references on > > the focusing track, then selecting the appropriate f/stop to cover it, > > i.e. 1/2 in front...1/2 behind. > >But focus isn't linear WRT the position on the rack. If you move the >lens mount to halfway between your focus for near and far >distance, you aren't focussing on a point midway between the >objects, no?