Re: [photo-3d] Camera Coupling - Digital

[Brian Reynolds <reynolds@xxxxxxxxx>]

People need to be a bit more careful about attributions.  John trimmed
things so that it looks like Eric said things that I actually said.
This isn't directed solely at John.  Several people on the list have
been a bit sloppy with attributions.

John A. Rupkalvis wrote:
> ----- Original Message -----
> From: "Brian Reynolds" <reynolds@xxxxxxxxx>
> To: <photo-3d@xxxxxxxxxxxxxxx>
> Sent: Friday, April 06, 2001 9:59 PM
> Subject: Re: [photo-3d] Camera Coupling - Digital
> 
> 
> > Eric Miner wrote:
> > The scanning backs for 4x5 cameras can currently just about match 4x5
> > film.
> 

Actually I said that.

> 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.
> 

The "single shot" backs for MF and 4x5 cameras are in fact physically
smaller than a frame of MF film.

The scanning backs I mentioned are not area arrays (the rectangular
sensors most people think about).  They are linear arrays like those
found in a flatbed scanner.  The array is the full width of a sheet of
4x5 film (give or take a little) and the sensor is moved across the
full length of the film aperture during exposure.  Because the sensor
moves during the exposure (often mutiple times to get color
information) these camera backs tend to be used for studio still life
and product shots, but at least one landscape photographer (Stephen
Johnson <URL:http://www.sjphoto.com/>) is dragging a full setup (4x5
camera, digital back and Mac Power Book) to the national parks.  These
backs produce very large files (e.g., the back Johnson uses produces a
130MB file).

[very good description of motion picture film formats snipped]

-- 
Brian Reynolds                  | "Dee Dee!  Don't touch that button!"
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http://www.panix.com/~reynolds  |    -- Dexter and Dee Dee
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