Archived posting to the Leica Users Group, 2014/02/21

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Subject: [Leica] OT - Sony Alpha 7R
From: sonc.hegr at gmail.com (Sonny Carter)
Date: Sat, 22 Feb 2014 00:57:31 -0600
References: <27260333.1393040158349.JavaMail.root@elwamui-rustique.atl.sa.earthlink.net> <024c01cf2f90$3bfa4fd0$b3eeef70$@verizon.net> <B84FC739-8534-4734-A630-5ED84FC0303B@gmail.com> <025401cf2f92$c79f24a0$56dd6de0$@verizon.net>

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
> 
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> Leica Users Group.
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> 
> 
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Replies: Reply from rgacpa at gmail.com (Bob Adler) ([Leica] OT - Sony Alpha 7R)
Reply from red735i at verizon.net (Frank Filippone) ([Leica] OT - Sony Alpha 7R)
In reply to: Message from wildlightphoto at earthlink.net (Doug Herr) ([Leica] OT - Sony Alpha 7R)
Message from red735i at verizon.net (Frank Filippone) ([Leica] OT - Sony Alpha 7R)
Message from sonc.hegr at gmail.com (Sonny Carter) ([Leica] OT - Sony Alpha 7R)
Message from red735i at verizon.net (Frank Filippone) ([Leica] OT - Sony Alpha 7R)