Archived posting to the Leica Users Group, 2014/02/21
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]So how can you know how it doesn't do it and not know how it does it at the same time? ;-) Sent from my iPhone Sonny Carter http://www.SonC.com/look > On Feb 21, 2014, at 11:56 PM, "Frank Filippone" <red735i at verizon.net> > wrote: > > 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 > > > _______________________________________________ > Leica Users Group. > See http://leica-users.org/mailman/listinfo/lug for more information