Archived posting to the Leica Users Group, 2012/07/21
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]Herb I would add that the M framing of course is only a guide and the instruction books show approximate error (in frameline widths) at minimum/maximum distance Cheers, Geoff http://www.pbase.com/hoppyman On 22 July 2012 13:23, Herbert Kanner <kanner at acm.org> wrote: > 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<http://www.richardmanphoto.com> >> > >> >> > >> >> >> >> ______________________________****_________________ >> >> Leica Users Group. >> >> See >> http://leica-users.org/****mailman/listinfo/lug<http://leica-users.org/**mailman/listinfo/lug> >> <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> >> <http://**leica-users.org/mailman/**listinfo/lug<http://leica-users.org/mailman/listinfo/lug>>for >> >> more information >> > >> >> >> >> -- >> // 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 >