Archived posting to the Leica Users Group, 2003/07/21

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Subject: RE: [Leica] Further digital exploration - now 4/3 system
From: Dan C <leicaman@sympatico.ca>
Date: Mon, 21 Jul 2003 15:19:44 -0400
References: <p05100309bb41c5f16fa5@[10.0.1.4]>

My understanding is that the various numbers you see associated with image
sensors such as 2/3 and 1/1.8 etc. are holdovers from the days of video
cameras which used analog glass tube (photomultipliers ?) sensors.   These
numbers refer to the outer diameter of the long glass envelope of the tube.
 The actual size of CCDs is much smaller than these designations.  It also
has nothing to do with the aspect ratio.


dan c.


At 02:28 PM 21-07-03 -0400, 
>Henning wrote:
>> I have heard a number of explanations of this '4/3' thing, such as it
>> being the size of the sensor via some calculations, but it appears to
>> me to only apply to the ratio of the format. Does anyone know
>> definitively?
>

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In reply to: Message from Henning Wulff <henningw@archiphoto.com> (RE: [Leica] Further digital exploration)