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

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Subject: Re: [Leica] Re: leica digital
From: Jerry Lehrer <jerryleh@pacbell.net>
Date: Wed, 25 Jun 2003 15:04:31 -0700
References: <NABBLIJOIFAICKBIEPJJCEFAGPAB.darkroom@ix.netcom.com>

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

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
>
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Replies: Reply from Rolfe Tessem <rolfe@ldp.com> (Re: [Leica] Re: leica digital)
In reply to: Message from "Austin Franklin" <darkroom@ix.netcom.com> (RE: [Leica] Re: leica digital)