Archived posting to the Leica Users Group, 2009/04/02

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Subject: [Leica] LUG Digest, Vol 41, Issue 124. SCANNING
From: leica at ralgo.nl (leica)
Date: Thu, 02 Apr 2009 19:49:02 +0200
References: <380-22009442164458834@M2W015.mail2web.com>

You missed the point.

Bruce.

On 2-apr-2009, at 18:44, wildlightphoto at earthlink.net wrote:

> On 2-apr-2009, at 5:39, Lawrence Zeitlin wrote:
>
>>
>> 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.
>>
>>
>> Doug,
>>
>> 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.
>
> The whole point of a full-frame M is to use the full image circle of
> wide-angle lenses, and there's no need to go to a 'scanning back'  
> or any
> other full-frame solution to avoid angle-of-incidence problems if the
> camera is restricted to 50mm or longer lenses.
>
> Doug Herr
> Birdman of Sacramento
> http://www.wlidlightphoto.com
>
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In reply to: Message from wildlightphoto at earthlink.net (wildlightphoto at earthlink.net) ([Leica] LUG Digest, Vol 41, Issue 124. SCANNING)