Re: flatbed scanhead in rotating camera

[Ernst Dinkla <ernst@xxxxxxxxxxxxxxx>]

In <URL:news:lokaal.panorama> on Tue 20 Jun, ADavidhazy wrote:

> I have (and others before me also) done something similar to this. In my case I
> took the linear array out of a small hand scanner and installed it in a channel
> I attached to the back of a 35mm camera. Keeping the camera still and pulling
> the array across the image plane gives you the equivalent of a still camera
> fitted with a slow moving focal plane shutter. Keeping the array still and
> rotating the camera gives you panoramic photographs and keeping camera still
> and rotating the subject gives you peripheral or "rollout" records. 
> 
> Got a pair of little articles at:
> http://www.rit.edu/~andpph/text-demo-scanner-cam.html
> http://www.rit.edu/~andpph/text-better-scanner-cam.html
> 
> Generally, however, you need to keep in mind the aspect ratio for which the
> scanner is set up. Most would be something like 9x12 inches so not quite the
> 1:8 aspect ratio that you are hoping for. Whiule you could cut down on the
> height keeping the length the same and that would improve the aspect ratio,
> this generally means loss of "pixels" or information in one direction.
> 
> A more interesting solution would be to "massage" the hardware or software in
> such a manner that it does not stop recording data and continuously spews out
> image info ... of course, a 1G or more file then would be the problem of the
> computer.
> 
> great fun but now what's next??

A bit more off topic.
For some time I have thought about a similar concept. I have a big
obsolete vertical enlarger/camera (neg. size 10" x 13", 10' high, 38" x
57" bed), cast steel etc. so heavy enough. I also have an obsolete
flatbed scanner for the first attempt. If I remove the glass plate of
the scanner and adjust the CCD array to change the focusing one way or
another but keep the mechanical movement of the scanner, install it
where the negative carrier was (tried it, and it works upside down),
what will be the problem? If light is a problem, will changing the speed
of scanning improve that? Is there a website that has information on
this subject?

I know this can be solved by buying a digital scanning back, but the
price is steep, especially if one would like more resolution. As
there are true 1200 dpi flatbeds appearing that aren't that expensive
it could become a nice digital camera for repro work.



Ernst
-- 
Ernst Dinkla  Serigrafie,Zeefdruk            The point will never be metric