Archived posting to the Leica Users Group, 2014/02/21
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]You would need a reference calibration somewhere...and to be honest, the camera does NOT know what is actually in focus and what is not.... it only knows what should be in focus.... it is an open loop system.... Would you like to sit there at every F stop (and FL for a zoom) and calibrate the focus shift for every combination? This is a factory calibration, not a user calibration Frank Filippone Red735i at verizon.net -----Original Message----- From: lug-bounces+red735i=verizon.net at leica-users.org [mailto:lug-bounces+red735i=verizon.net at leica-users.org] On Behalf Of Sonny Carter Sent: Friday, February 21, 2014 9:49 PM To: Leica Users Group Subject: Re: [Leica] OT - Sony Alpha 7R Couldn't the camera calibrate the lens? After all, it is an optical computer; what is one more task added? Sent from my iPhone Sonny Carter http://www.SonC.com/look > On Feb 21, 2014, at 11:37 PM, "Frank Filippone" <red735i at verizon.net> wrote: > > That would require calibration of each lens ( maybe they all act the > same????)... > > I would think of this as a really good idea, but I also thought a R10 > was a really good idea...... > > Frank Filippone > Red735i at verizon.net > > > Frank Filippone wrote: > >> >> If you are focusing at working aperture, what advantage is there to >> native lenses? >> >> I'm not so sure Sony has this thought out...... > > For those who are interested in such things, native-mount lenses will > allow shutter-priority and program exposure modes, and AF. > > Another way to handle focus shift would be to program the lens to tell > the camera how much shift there is at various apertures. Given this > would be a native-mount lens the camera would know what aperture the > lens will be using. > > Doug Herr > Birdman of Sacramento > http://www.wildlightphoto.com > > > > > _______________________________________________ > 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