Archived posting to the Leica Users Group, 2003/06/25

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Subject: Re: [Leica] Re: leica digital
From: Rolfe Tessem <rolfe@ldp.com>
Date: Wed, 25 Jun 2003 18:30:52 -0400
References: <NABBLIJOIFAICKBIEPJJCEFAGPAB.darkroom@ix.netcom.com> <3EFA1C6F.DC3EDA32@pacbell.net>

Jerry Lehrer wrote:
> Austin
> 
> Does that presuppose that the R8/9 shutter has to be locked
> open when the digital back is in place, and the hardware of the
> sensor support protrudes forward of the focal plane?
> 
> Jerry

Why don't you guys just go to Leica's site and watch/listen to the news 
conference where all these questions (and more) were answered in detail.

And no, the shutter is not locked open.

And no, there is no anti-aliasing filter.

Sheesh.


Rolfe

> Austin Franklin wrote:
> 
> 
>>Hi Adam,
>>
>>
>>>On 2003-06-25 darkroom@ix.netcom.com (Austin Franklin)
>>>thoughtfully wrote:
>>
>>I'd like to think of it that way ;-)
>>
>>
>>>>I don't believe there will every be a full frame "back" for the
>>>
>>>R8/9.  There
>>>
>>>>are physical limitations that make this not possible.
>>>>
>>>
>>>Could you explain for us what those are Austin? Does it have to
>>>do with the
>>>actual dimensions of the chip and its support circuitry?
>>
>>The physical sensor is one issue, and it has to fit at A particular
>>spot...AT the film plane.  Not before, not after...  The sensors have a lot
>>in front of and around them, Bayer pattern color filters, anti-aliasing
>>filters and an IR filter.  This adds depth/thickness/width/height needed in
>>front of and around the sensor...and therefore the film gate has to be deep
>>enough, and wide/tall enough to support all this.
>>
>>The reason a reduced size sensor works is it fits IN the film gate.  A full
>>frame sensor would most likely not.  I think there is money to be made by a
>>savvy sensor manufacturer who makes a sensor that maximizes the available
>>area within the film gate...but they all seem to fall "short".  The sensor
>>used in the R digital back is basically a half frame sensor!  It's only
>>17.6mm x 26.4mm...I believe.  It's 456 sq mm, and 35mm film provides 864 sq
>>mm.
>>
>>Regards,
>>
>>Austin
>>
>>--
>>To unsubscribe, see http://mejac.palo-alto.ca.us/leica-users/unsub.html
> 
> 
> --
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- -- 
Rolfe Tessem      |     Lucky Duck Productions, Inc.
rolfe@ldp.com     |     96 Morton Street
(212) 463-0029    |     New York, Ny 10014

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Replies: Reply from Ted Grant <tedgrant@shaw.ca> (Re: [Leica] Re: leica digital)
In reply to: Message from "Austin Franklin" <darkroom@ix.netcom.com> (RE: [Leica] Re: leica digital)
Message from Jerry Lehrer <jerryleh@pacbell.net> (Re: [Leica] Re: leica digital)