Archived posting to the Leica Users Group, 2004/09/25
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]> Ted Grant wrote the following regarding this "focus and recompose" > thread: > > Richard, thank you. ;-) > > I read the focusing formula and I figured by the time I read that and > then > tried to figure out exactly what it says and is supposed to do with near > every frame I'd still be shooting my first roll of film from 55 years > ago. > ;-) > > Jeeeeeeeeeeeesh why is it an old fart like me who's shot thousands upon > thousands of frames and never encountered this focus thing, never knew > about > it and never had it happen that I'm aware of. > > Absolutely wild stuff gang, man it's hard enough just getting the damn > shot > without having some other thing to clutter one's mind on how to take > sharp > pictures. :-) Just line-up the two images and hit the button! Well OK > squeeze gently on the shutter release. ;-) > > I suppose I've been one extremely lucky SOB all these years and never > knew > anything about this messin' with the focus tab or whatever. But I seem > to > re-cal a hell of a lot of my frames were Leica sharp all the time even > in > available darkness. :-) > > Oh well one more techie thing to confuse my failing mind. :-) > > ted > > Then Tina Manley supplied the following comment: > > Hi, Dr. Jean - Very interesting for taking photos of lens charts on the > > wall! I can't imagine trying to figure all of that out while my > families > are going about their everyday lives. People are moving around grinding > > corn and feeding chickens! I have to focus quickly and move on. Who > has > time to figure all of this out and focus and reframe? Unless the > subject > is inanimate or dead! > > Tina > > > Then Henning Wulff provided this additional perspective: > > While these calculations and formulae are correct, the point is still > moot due to the almost universal field curvature, especially of fast > lenses, at shorter distances. > > After these calculations, you won't be closer to the truth or focus, > _and_ your subject will be gone to sleep or just plain gone. > > -- > * Henning J. Wulff > > And now I feel a strong need to comment on all of the above, despite the > unfortunate fact that I'll be out of town and out of touch for several > days and therefore unable to respond to possible responses: > > As is so often the case, all of you grasp some part of the truth of the > matter. > > Ted, I can't begin to express my gratitude to you not only for your > grace with the tools and the medium, but with your generosity in sharing > the benefits of your years of experience. In fact, your last lengthy > dispatch regarding your shooting technique reminded me that while my > reflexes for capturing what I'm after keep improving, it's the quantum > leap into being able to anticipate the best instant to push the button > that is still out of reach. > > Tina, you also get the "life and its representatives wait for no nerd" > concept. > > Henning, I'm glad someone besides me recognises the reality of field > curvature for our work. > > However, I'm here to tell you that anyone who thinks that they can just > focus with the rangefinder and then put the main subject anywhere else > in the frame with a 35mm f2 lens wide open is missing an important > refinement in Leica M technique. > > I have frames on my contact sheets that I know were focussed accurately > according to the rangefinder with a fast enough shutter speed where the > reframed faces are just plain out of focus. > > Now; whether or not we can become facile enough to pull off an > appropriate compensation maneuver without losing the thing that makes us > want to shoot this frame in the first place is the real question. But > anyone who claims that the effect just doesn't exist is wrong. > > Ted, the "never had it happen that I'm aware of" part of your response > may be all too true. And Tina, this ain't about charts on walls - it's > about people's eyes being in focus. > > One of the potential benefits of this list is the possibility that > intuitive artists and those who sometimes resort to basic arithmetic and > trigonometric principals will learn something from each other. > > Bob Palmieri > _______________________________________________ Also the people who do not should realise that without those who do they would travel on foot and practise PJ with a sketchbook. best regards simon jessurun