Archived posting to the Leica Users Group, 2009/04/01

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Subject: [Leica] LUG Digest, Vol 41, Issue 124
From: wildlightphoto at (Doug Herr)
Date: Thu, 2 Apr 2009 00:31:24 -0400 (EDT)

Larry, consider slow exposures with this concept.  The sensor strip is at 
each pixel position for the length of the exposure, then it moves to the 
next position to stay for an equal length of time, then to the next.  Not 
very practical for a hand-held camera.  And there's that electronic flash 

Doug Herr
Birdman of Sacramento

-----Original Message-----
>From: Lawrence Zeitlin <lrzeitlin at>
>Sent: Apr 1, 2009 11:39 PM
>To: lug at
>Cc: Lawrence Zeitlin <lrzeitlin at>
>Subject: Re: [Leica] LUG Digest, Vol 41, Issue 124
>On Apr 1, 2009, at 10:20 PM, Doug wrote:
>> Lawrence Zeitlin wrote:
>> a scanning sensor need only cover the frame in
>> 1/30 to 1/50 second. That's the speed the shutter slit moves in film
>> Leicas. Rotating the sensor strip would not be a problem at that slow
>> speed. Still a mechanical kludge however.
>> <<<
>Doug answered:
>> Even if the sensor strip could scan at that speed and rotate enough
>> (variable rotation for a variety of lenses) anyone who wants to use
>> electronic flash is SOL.  The scan strip would also have to cover  
>> the frame
>> at a constant speed, something which mechanical shutter blades  
>> don't do.
>I'm not about to design a full frame Leica. BUT moving a sensor 1  
>1/2" at a constant speed is no big deal in this day of linear motors  
>and electronic speed measurement.  Tilting a sensor a couple of  
>degrees as it travels is no big deal either. The disc drive in your  
>computer moves a read/write head to a variety of positions in a 30  
>degree arc in a tiny fraction of a second. It is hard to believe that  
>all the imaginative people in Solms couldn't come up with a way make  
>a full frame Leica, at least for lenses 50 mm or longer, perhaps a  
>digital M3. Reserve the M8 for wide angle fanatics. I'm still hoping  
>for a digital back to replace the film inspection door on my M series  
>film cameras. If one sold for $1000 or less I'd buy it in a minute.
>Leica, are you listening? If not, Epson are you listening?
>Larry Z
>Leica Users Group.
>See for more information