Archived posting to the Leica Users Group, 2015/11/02
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]The Leicaflex (original) used a sloped cam outwardly similar to an M lens' focussing cam. The body's axial cam follower (at the top of the mirror box) read this cam as actual lens aperture (for the non-TTL meter, much like the Nikon F rabbit ears). The Leicaflex SL and SL2 use a second sloped cam, similar to the first but at the bottom of the mirror box, that indicated aperture relative to full aperture for TTL metering (like auto-indexed rabbit ears or Nikon's AI tab). The R cam (R3 onward) a.k.a. 3rd cam used a rotational cam that indicated both actual aperture and aperture relative to maximum. It would be messy to sort these out in an adapter. Doug Herr Birdman of Sacramento http://www.wildlightphoto.com http://doug-herr.fineartamerica.com -----Original Message----- >From: Frank Filippone <red735i at verizon.net> >Sent: Nov 2, 2015 10:22 PM >To: 'Leica Users Group' <lug at leica-users.org> >Subject: Re: [Leica] The SL > >One word answer..... No. > >The easy part is the auto aperture.... which is a simple linear actuator >requirement. The hard part will be the transfer of set aperture to the >body. >I have forgotten ( if I even ever knew) how the Leicaflex transferred >Aperture information to the body, but I do not think it was electrical... I >think it was a mechanical linkage.... >That could be done with a pretty simple resistive element..... If this >were implemented, it would mean Aperture Priority only..... ( metering >system adjusts shutter speed to get proper exposures) > >Again, my Analog Circuit Design background allows me to think of this... it >does not mean Leica agrees..... > >Frank Filippone >Red735i at verizon.net > > > >Is there any technical reason why this is difficult (Auto Exposure feature >for R lenses)? Nikon DSLR AF lenses work fine on the Nikon 1 mirrorless >systems, with both AF and AE (most features) enabled via an adapter. >Cheers >Jayanand > >On Tue, Nov 3, 2015 at 5:37 AM, Frank Filippone <red735i at verizon.net> >wrote: >> If it were as easy as a simple tube, which is the adapter without the >> auto feature, there is no reason that it would not have been available >> now. It is so trivial, that the Chinese copy cats have probably already >done it..... >> ( somewhat tongue in cheek.)... Checking after I wrote that, I found >> that Novoflex has the adapter ( dumb, no auto feature), called the >> LET/LER. So you can use your R lenses on your SL body, as soon as they >ship them..... >> >> That is the primary reason I think that it will the Auto feaqture..... >> that it is taking a year to come out..... >> >> I have no real info, nor am I on the inside track at Leica..... I am >> purely speculating... >> >> But if it did have the Auto feature, it would be the single most >> brilliant implementation Leica has had since the LTM to M adapters..... >about 1953. >> >> Frank Filippone >> Red735i at verizon.net >> >> >> -----Original Message----- >> From: LUG [mailto:lug-bounces+red735i=verizon.net at leica-users.org] On >> Behalf Of Akhil Lal >> Sent: Monday, November 02, 2015 3:48 PM >> To: Leica Users Group >> Subject: Re: [Leica] The SL >> >> Actually I was told by a Leica rep at PhotoExpo that the R adapter >> would not have an auto stop down mechanism. Of course he could be >> wrong, or they might reconsider.... >> >> On Mon, Nov 2, 2015 at 6:01 PM, Frank Filippone <red735i at verizon.net> >wrote: >> >>> There is no published information that the R to TL adapter has or has >>> not the auto stop down abilities. >>> >>> The R to M adapter plus the M to TL adapter, which they now recommend >>> until the one piece adapter becomes available, does not. >>> >>> Frank Filippone >>> Red735i at verizon.net >>> >>> The facht that the R adapter tube does not stop down R lenses seems a >>> problem to me, however perfect this camera would be. >>> >>> >>> Cedric Agie >>> Brussels >>> >>> >>> >>> >>> _______________________________________________ >>> Leica Users Group. >>> See http://leica-users.org/mailman/listinfo/lug for more information >>> >> >> _______________________________________________ >> Leica Users Group. >> See http://leica-users.org/mailman/listinfo/lug for more information >> >> >> _______________________________________________ >> Leica Users Group. >> See http://leica-users.org/mailman/listinfo/lug for more information > >_______________________________________________ >Leica Users Group. >See http://leica-users.org/mailman/listinfo/lug for more information > > >_______________________________________________ >Leica Users Group. >See http://leica-users.org/mailman/listinfo/lug for more information