[Tig] camera dynamic range quotes are getting silly!
richard at filmlight.ltd.uk
Fri Mar 4 23:03:35 GMT 2011
> peter_swinson at compuserve.com
> If I wanted to compete with the mega stops range, but with film, and
> avoid the different movement artefacts with multiple shutter rates
> per frame, I reckon here is the solution.
> Take one Technicolor 3 stripe camera, remove the color beam
> splitter, replace with a semi silvered splitter. Use three color neg
> stocks, 1 very fast, one medium, one very slow. Shoot, process,
> scan and then combine the results.
Not entirely silly. There used to be a three-layer black and white
film with three emulsions, each with 100th of the sensitivity of the
level above. This was used in the 1950's and probably 60's to
photograph surface nuclear tests. As usual, the contrast range was
probably limited by flare, but the need was to cover a rapidly
changing image brightness when an automatic iris could not ber fast
The better solution would be to have a detector and electrowetting
display a bit off the focal plane. This could reflect light from the
bright regions and let it through in the dark regions. If the
electrowetting display used mercury, it could reflect the light back
out of the front lens, so it did not add to the flare in the camera.
This assembly would not have to be as high resolution as the actual
detector if it was off the focal plane.
You could have a similar plate that worked the other way around for
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