Archived posting to the Leica Users Group, 2004/03/28

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Subject: [Leica] M7 Digital (real one!! :-) ) in LFI
From: Frank.Dernie at btinternet.com (Frank Dernie)
Date: Sun Mar 28 00:34:00 2004
References: <f.25535b40.2d9729b6@aol.com>

No, I am just a design engineer with 30+ years of experience and nobody 
has broken the laws of physics yet. There are some ameliorations 
possible - particularly if standards are lowered. Until there is a 
sensor with a planar surface which needs no additional microlenses or 
filter it will not be possible to use all M lenses equally well, or any 
other for that matter it is just that lenses very close to the sensor 
exacerbate the problem. It is quite noticeable, and well documented in 
Chasseur d'Images that even with slr lenses there is a significant 
difference in "match" between different lenses and cameras. I do not 
have the article to hand, but one of the L Canon lenses matched the EOS 
10D much better than the EOS 1Ds. It is obvious when you look at a ray 
trace that this must happen with a layered sensor, it is merely a 
question whether the shortcomings are acceptable or not at the 
magnifications used.
I guess Leica thought not but decided to respond to Epson in case the 
level of quality was acceptable to customers (even if the Leica 
engineers were not satisfied themselves). Maybe there is a new type of 
planar sensor in the offing that is secret at present. I still wish 
they would make a replacement door for any M with sensor and contacts 
to a base with the electronics in - I would be happy to cock the 
shutter manually.
Frank


On 27 Mar 2004, at 19:02, Leicajay@aol.com wrote:

> <<In a message dated 03/27/2004 1:32:26 PM Eastern Standard Time,
> Frank.Dernie@btinternet.com writes:
> I doubt there is suddenly a technical solution to suit all lens designs
> since each M lens has a unique set of angles of incidence to the
> focussed plane - see Erwin's book. Perhaps by accepting lower standards
> and using APS sized sensor the worst of the problems can be 
> neglected.>>
>
>
> Oh ye of little faith in Leica ;>)
> _______________________________________________
> Leica Users Group.
> See http://leica-users.org/mailman/listinfo/lug for more information
>


Replies: Reply from rclark01 at comcast.net (Robert Clark) ([Leica] M7 Digital (real one!! :-) ) in LFI)
In reply to: Message from Leicajay at aol.com (Leicajay@aol.com) ([Leica] M7 Digital (real one!! :-) ) in LFI)