Archived posting to the Leica Users Group, 2012/07/22
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]In Nikons, I think that was called a K-Screen. Sent from my iPad Jeffery L. Smith New Orleans, Louisiana USA On Jul 22, 2012, at 17:40, Herbert Kanner <kanner at acm.org> wrote: > If you remember film SLR cameras, they all had a focusing aid in the > center of the screen, implying that just focusing on a ground glass was > sometimes difficult. The first kind I saw were a couple of shallow crossed > prims in the center, giving the effect of a split image rangefinder. Years > ago, I did a calculation that I don't think I'm competent to repeat now, > but the calculation showed that the image separation of the simulated > rangefinder was equivalent to that of a true rangefinder whose base was > the diameter of the lens aperture--i.e. piss poor. Then a better thing > showed up, a large cluster of micro prisms in the center. The hand shake > of even the steadiest photographer was enough to make an out of focus > image shimmer. However, on a tripod, this system was useless. > > So, a viewfinder display derived from the image on the sensor would be at > best equivalent to that on a ground glass. To be practical, this would > have to be supplemented by a display of the kind of signal that actuations > auto-focus systems, for example, an indication of local contrast, which > decreases when going out of focus. > > Herb > > >> Can't be THAT hard. It would amaze you what can be done in SW, and then >> implemented in HW. >> >> If you make it a priority of your design team...... >> >> But let me go back to basic RF cameras..... >> >> If you employ LiveView in the VF ( which I believe is called EVF or >> something like that), and you use a really good LCD/LED display for the >> image, you are basically looking through a SLR camera. Better than that is >> the fact that you are actually looking at the "film" plane . No more out >> of >> focus adjustment cameras or lenses.... WYSIWYG. Period. Make the LCD a >> really good one, and it would make a surprisingly good focusing system. >> Noctilux capable..... >> >> Did I mention cheap? I should have..... >> >> And the implementation of AF is pretty easy, but then again, how do you >> make >> the M mount lenses move in and out for focusing? Move the mounting plane? >> >> Personally, I like the idea of an EVF..... >> >> I do not like the idea of a big honking rear mounted LCD that is my >> primary >> focusing and viewing device... Ii think those are insufficient to promote >> good technique. >> >> Let's just hope Leica actually makes a M10 at a price point we can >> afford.... God knows, the M9 MSRP was way above mine..... >> >> ( Thanks John.....!) >> >> Frank Filippone >> Red735i at earthlink.net >> >> >> >> >> _______________________________________________ >> 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. > > _______________________________________________ > Leica Users Group. > See http://leica-users.org/mailman/listinfo/lug for more information