Archived posting to the Leica Users Group, 2014/02/22
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]Scary. First post in this thread I've followed... ;-) Sent from my iPad > On Feb 21, 2014, at 10:57 PM, Sonny Carter <sonc.hegr at gmail.com> wrote: > > 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 > > _______________________________________________ > Leica Users Group. > See http://leica-users.org/mailman/listinfo/lug for more information