Archived posting to the Leica Users Group, 2001/11/04

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Subject: [Leica] Re: Vs: digital
From: Jim Brick <jim@brick.org>
Date: Sun, 04 Nov 2001 16:03:44 -0800
References: <003101c16566$6c665580$be04a5c3@default>

I have and have used over the past three years, a Philips 6mp chip. It is 
laid out in quadrents and all four quadrents must be read in 
simultaneously. The data is seriously convoluted and takes "major" 
electronics and firmware to put it back into the proper order as if it were 
a normal CCD. And to do this on the fly for six million pixels, and then do 
interpolation, color space conversion, PRNU (dead or damaged pixel repair), 
etc... is a major operation. So I suspect that the task was a bit 
overwhelming for a consumer level camera.

The CCD I have does work and does take photographs. Perhaps Philips 
re-designed it and introduced new problems.

As far as an M mount digital camera goes, as I have said numerous times 
before, the resolution and MTF curves for modern M lenses is not compatible 
with imaging on a CCD or CMOS sensors.

Jim


At 12:48 PM 11/4/2001 +0000, George Day wrote:
>No kidding?  What sorts of problems?
>
>on 11/4/01 7:24 PM, Raimo Korhonen at raimo.korhonen@pp2.inet.fi wrote:
>
> > Well, Contax/Yashica/Kyocera do not have the chip either - it is 
> designed by
> > Philips and they seem to have problems with it. Pentax already dropped 
> their
> > camera which was to use it.
> > All the best!
> > Raimo
> > Personal photography homepage at
> > http://personal.inet.fi/private/raimo.korhonen
> >
> > -----Alkuperäinen viesti-----
> > Lähettäjä: George Day <george@rdcinteractive.com>
> > Vastaanottaja: leica-users@mejac.palo-alto.ca.us
> > <leica-users@mejac.palo-alto.ca.us>
> > Päivä: 04. marraskuuta 2001 19:17
> > Aihe: digital, was: Re: [Leica] Piezo Plunge
> >
> >
> >> Well,
> >>
> >> This has been beaten to death, but a digital M-mount camera would make all
> >> the sense in the world.  Not for the purist, of course, but you can 
> bet many
> >> an amateur and working photographer on pounce on such a beast.  If Leica
> >> could get their hands on (assuming they don't have it) a Contax-style
> >> full-frame chip...
> >>
> >
> >
> > --
> > To unsubscribe, see http://mejac.palo-alto.ca.us/leica-users/unsub.html
>
>--
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Replies: Reply from "Dan Post" <dpost@triad.rr.com> (Re: [Leica] Digital Dreams)
Reply from Jim Brick <jim@brick.org> ([Leica] Re: Re: Vs: digital)
In reply to: Message from "Raimo Korhonen" <raimo.korhonen@pp2.inet.fi> (Vs: digital, was: Re: [Leica] Piezo Plunge)