Archived posting to the Leica Users Group, 2012/07/21
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]Wow! That was something I was not aware of and had me going for a while. Then I started thinking about it like the physicist I once was. I said, ok, when you get closer, the lens has to move away from the sensor/film. Now think about a pinhole, which could be thought of as an highly stopped down lens. As the pinhole moves away from the film/sensor, the angle subtended by same becomes smaller. So the frame lines in the viewfinder should get closer to each other, making a smaller rectangle. Good to be forced to think once in a while. Herb >Thanks Herb. I am aware of that. I am referring to the size of the >framelines. As you get closer, the coverage should get smaller. > >On Sat, Jul 21, 2012 at 9:39 AM, Herbert Kanner <kanner at acm.org> wrote: > > > Richard, > > > > We already have parallax adjustment based on focusing distance on all M? > > cameras. Hold your camera very steady and watch the frame lines as you > > focus from minimum distance to infinity. If it isn't visible on those > 28mm > > lines, shift the control to 35mm or longer or put in a longer lens. > > > > Regards, > > > > Herb > > > > > > > > > > Speculating on an ideal optical rangefinder system (i.e. something that > >> retains the Leica M DNA and yet improves on the 1950 state of the art > M3), > >> what if a rangefinder has the following features: > >> > >> - LED projected framelines. This removes the clutter, solves the > >> visibility > >> issue, and > >> > >> - changeable rangefinder magnification - what if the rangefinder has > 0.58x > >> to 1.2x mag builtin (may be in 4 steps: 0.58x, 0.72x, 0.9x and 1.2x or > >> something similar)? This would allow more precise focusing from the > wide > >> to > >> tele. This will leverage the existing frame line trigger and 6 bit > coding > >> system of course so this would be automatic > >> > >> - parallax adjustment based on focusing distance > >> > >> We know LED framelines can be done. The M9 Titanium has it. > >> > >> The XPan has 2 magnifications: one for the 45mm lens and one for the > 90mm > >> lens. I have no idea how difficult it is to insert multiple mag piece > as > >> needed. Anyone knows? > >> > >> The cam position should also give good indication of the focusing > distance > >> too, along with the lens info, so #3 is technically feasible too. > >> > >> Chances are Leica nor anyone else would really spend the resource to > >> develop something like these, since a CMOS/Liveview is so much > "simpler," > >> but would it be nice to have such a system? > >> > >> -- > >> // richard ><http://www.richardmanphoto.**com<http://www.richardmanphoto.com> > >> > > >> > >> ______________________________**_________________ > >> Leica Users Group. > >> See >http://leica-users.org/**mailman/listinfo/lug<http://leica-users.org/mailman/listinfo/lug>for > > >more information > >> > > > > -- > > Herbert Kanner > > kanner at acm.org > > 650-326-8204 > > > > Question authority and the authorities will question you. > > > > > > ______________________________**_________________ > > Leica Users Group. > > See >http://leica-users.org/**mailman/listinfo/lug<http://leica-users.org/mailman/listinfo/lug>for > > >more information > > > > > >-- >// richard <http://www.richardmanphoto.com> > >_______________________________________________ >Leica Users Group. >See http://leica-users.org/mailman/listinfo/lug for more information -- Herbert Kanner kanner at acm.org 650-326-8204 Question authority and the authorities will question you.