Archived posting to the Leica Users Group, 2002/03/08

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Subject: Re: [Leica] Digital Back for leica M, Data back for Leica M
From: Mark Kronquist <mak@teleport.com>
Date: Fri, 08 Mar 2002 09:40:29 -0600

There once was a company called ifilm that has probably tied the whole idea
up in patents for products that never materialized.

I am currently working on adapting a Magnavision S2 back to an M camera

One pass 2048 CCD  Mark

> From: Grégoire Vandenschrick <vandenschrick@geog.ucl.ac.be>
> Organization: ucl
> Reply-To: leica-users@mejac.palo-alto.ca.us
> Date: Fri, 8 Mar 2002 17:20:52 +0100
> To: <leica-users@mejac.palo-alto.ca.us>
> Subject: [Leica] Digital Back for leica M, Data back for Leica M
> 
> Hi everybody,
> 
> I was thinking about the possibility to have a digital back for leica M.
> This could be very interesting, with maybe all the electronics put into a
> 24x36 cartridge, and linked through a special base plate. I discused it with
> a dealer in Brussel (Campion) and it seems that a full frame (24x36) ccd
> exists, but that it cannot be used in 24x36 because of an angle question
> (the light has to arrive at the ccd surface with a quite little angle). so
> it will only be used for middle format (4.5x6, 6x6) digital back.
> 
> So, this problem seems to be a little bit the same as the light fall off in
> the squares of a ground glass (you know, in the corner of your old Rollei
> waist level finder). In such situation, the solution is simple, the light is
> "redirected" by a fresnel lens just after the ground glass (or just
> before??).
> 
> Why couldn't this be done too for a ccd? Is the size of the
> fresnel/catadioptric facets too small to be produced with the current
> technologies? So, do we have to resign and never have for us a full frame
> digital ccd?
> 
> Another thought:
> 
> I was last days making a data base of all my negs, and, having some delay,
> some negs have no references. It's such a pain to record all this, and
> having to write every bit of info in the field, for each shot! not a work
> for me! As you know maybe, the Nikon F5 can not only store every info about
> each pictures it takes, but also print it on a frame when you rewind the
> neg. I was so thinking about a data back (I know, with a Leica M, even with
> the M7, you'll never have the diafragm value, neither the focus distance)
> that could print on a frame (on demand) the datas for all the pics, maybe
> just the time and date, some alphanumeric info you could enter for the neg
> (location name, lens used and so on). This would be beter than those ugly
> red marks on the right bottom corner of your pics. Maybe this could only be
> possible with the M7, but the M6 has sensors for speed, and if I remember (I
> will not take a pic of my office to confirm), the leds stop flashing when
> you fire, so, the M6 should be aware of the number of pics taken, or at
> least, this could triger the recording of the speed and time (set and given
> by the data back)
> 
> Well, that's it, quite stupid maybe, or quite common, I don't know, but I
> would like to hear from you all if these backs would be useful, or not, or
> maybe some of you should be able to kill some of my dreams by ingeneering
> advice about these (just to know it's feasable or not is a thing!).
> 
> Thank you
> 
> Greg VDS
> 
> Gregoire Vandenschrick
> Department of Geography
> Université catholique de Louvain
> 3, Place Pasteur
> B-1348 Louvain-la-Neuve
> Belgium
> vandenschrick@geog.ucl.ac.be
> Tel.: ++32 (0)10 47 24 42
> Fax.: ++32 (0)10 47 28 77
> http://www.geo.ucl.ac.be
> 
> 
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