Ken,
Look at the image http://home.hetnet.nl/~peter-ina/firstscan2.jpg
A scanner head looks always in one direction with a small angle.
At the left and the right side of the scanner there is no light that comes
into the scanner head. A black image (no image) is the results.
In the middle position of the scanner there is direct light that comes into
the scanner head. An image is the result.
Peter Sanders, Amsterdam, Holland
-----Oorspronkelijk bericht-----
Van: ken watson [mailto:[EMAIL PROTECTED]]
Verzonden: donderdag 11 januari 2001 22:57
Aan: [EMAIL PROTECTED]
Onderwerp: [Cameramakers] Scanner as film back
OK, I did it.
I leaned my cheapo scanner ( microteck C3 slimline, parallel
interface )against the back of my 5 X 7 camera and told it to scan. to see
the result see:
http://www.frii.com/~watsok/firstscan.jpg
This scanner is one of the thin line jobs which means it most likely has
what is known as a contact image sensor. They are known for having a depth
of field for focus of about 1 mm. The lens reduction, CCD type of scanners
are much better.
They also use three LED's for lighting vs a bulb so for dynamic range they
may be wanting. I assume I over powered the electronics by the nasty stuff
in the middle. This was exposed at f22 with a 6-7 inch lens ( not in front
of me and I do not remember it's size). It does not vignette as you see it
in the scans. It also does not streak ;<) I tried more and less exposure
but everything just fell off and the noise in the center remained
It looks like focusing on the beds' top surface will work and ground glass
is not needed.
Note. The light was on during the scan, there were light leaks most likely
every where . I used a large dark cloth and gasketed the light out as best I
could. But for a quick evaluation it served it's purpose.
_
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