[rollei_list] Re: Quiet, Please!

  • From: "Austin Franklin" <austin.franklin@xxxxxxxxxxx>
  • To: <rollei_list@xxxxxxxxxxxxx>
  • Date: Fri, 25 Sep 2009 14:06:13 -0400

Hi Peter,

You are right about the "wells" and that a typical digital sensor has light
falloff when the angle increases off perpendicular.

You most certainly don't mean "flatter" though.  A digital imaging sensor is
made from a silicon wafer, that has an overall wafer flatness (for say an 8"
wafer) to within say 20 or so um (micrometers or microns).  Smaller sensors
(let's say 35mm sized) will have an overall flatness of 5 or less microns.

Film, on the other hand, has a typical flatness, say, for 35mm, of say
between .6mm and 1mm across the film plane (or even worse).  That's at best
about 100 times less flat that a digital image sensor of similar size.

So, digital imaging sensors are far flatter than film typically will be,
even with a vacuum back or between polished glass plates.

Regards,

Austin

> -----Original Message-----
> From: rollei_list-bounce@xxxxxxxxxxxxx
> [mailto:rollei_list-bounce@xxxxxxxxxxxxx]On Behalf Of Peter K.
> Sent: Thursday, September 24, 2009 12:24 AM
> To: rollei_list@xxxxxxxxxxxxx
> Subject: [rollei_list] Re: Quiet, Please!
>
>
> Austin,
>
> Somehow I knew when I responded like that it may draw you out. Its not
> so much the surface but the fact that the pixels under that surface
> are not one unit as film is. This is the best way I can explain it.
> Since the pixels are like small buckets, there is light that does not
> short of entering a pixel when it exits the back of a lens.
> With film you have the entire plane (so to speak) receiving light.
> Yes, we can break film down to what specifically receives light, the
> layers, etc. but film can better receive light at an angle than a
> digital sensor. The easiest way to explain this was to use the flat
> term. To go into more detail in the article would cause the readers,
> working pros, to gloss over and not read it. Many working pros simply
> put the camera in P-Mode (P for Professional) and shoot. Its a much
> different world than it was 10-20 years ago when a photographer knew
> what an f-stop was and what sync speed meant. Today maybe 1 out of 3
> know this. And I am not kidding.
>
> Peter K
>
> On Wed, Sep 23, 2009 at 5:25 PM, Austin Franklin
> <austin.franklin@xxxxxxxxxxx> wrote:
> > Hi Peter,
> >
> >> No, you see film is flatter.
> >
> > Are you saying that the plane of the film is flatter than the plane of a
> > same sized digital sensor?
> >
> > Regards,
> >
> > Austin
> >
> > ---
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>
> --
> Peter K
> Ó¿Õ¬
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