Re: [photo-3d] Ultra Hi resolution digital photography with scanner technology

["John A. Rupkalvis" <stereoscope@xxxxxxxxxxxxx>]

----- Original Message -----
From: "Franklin J. Flocks" <fjf@xxxxxxxxx>
To: <photo-3d@xxxxxxxxxxxxxxx>
Sent: Wednesday, April 11, 2001 1:45 PM
Subject: [photo-3d] Ultra Hi resolution digital photography with scanner
technology


>        On April 6, 2001, Brian Reynolds wrote:
>
>        "The scanning backs for 4x5 cameras can currently just about
>        match half-frame 35mm film.  The actual image size of the
>        sensing surface (usable area) is actually quite a bit smaller
>        than 4x5, usually smaller than medium format.In all fairness,
>        some of the more expensive cameras and backs do exceed 16mm"
>        film."
>        ___________________________
>
>        This is not true.- With a scanning back, resolution far
>        greater than 35mm film is possible - What you lose is
>        your exposure time which may run up to 200 seconds as the
>        sensor moves across the "film plane."  - With a panoramic
>        set up, resolution of 6000 by 65,000 pixels is possible.

It is true.  You are not going to do much conventional action photography
(that you can normally do with 16mm, 35mm, 4x5, etc.) with exposure times of
over 3 minutes.  If you are going to make this comparison, consider this:
if you have the luxury of such abnormally long time exposures, you can use a
Lippman emulsion film in your film camera.  A Lippman emulsion resolves 3000
line pairs per millimeter.  That's 6000 x 6000 pixels (36 megapixels) PER
SQUARE MILLIMETER.  A standard 35mm still frame is 24mm x 36mm, or 864
square millimeters.  That's 31,104 megapixels or 31.1 gigapixels per
frame...

JR


 

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