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Do you feel Lucky?
"Roman J. Rohleder" wrote in message ... "Richard Knoppow" schrieb: "Peter Irwin" wrote in message The film base is very clear, not grey. If you are referring to 35mm B&W film being on a clear base it may be that Lucky is coating an anti-halation coating under the emulsion. They are not. And it´s the main flaw I found with these films. The location of the coating makes it function as an anti-light-piping coating as well eliminating the need for pigmenting the support. A friend of mine demonstrated that you could read a newspaper through the undeveloped film Worse is the photographic result - the lack of a anti-halation coating (AHU) contributes to halos and an overall unsharp appearance of the negativ under certain lighting conditions - like with a glaring piece of chrome or metal or the sun within the frame. Kodak pulled out of the Joint venture with Lucky some time ago. Gruss, Roman Fascinating, antideluvian film. I am not sure of the date anti-halation coatings were applied to roll film but they certainly date back to glass plates. In fact threre are instructions for making your own coating for plates in many ancient phtography books. Halation was much worse for plates than film but its amazing that anyone would make film now without the coating. Also, the back coating is also used for countering the curling tendency of the emulsion the anti-halation dye is usually included in this coating. If there is no back coating at all I suspect the film will curl very badly. FWIW normal emulsion is nearly transparent, this is why special motion picture effects could be made by bipacking (running two films through the camera emulsion to emulsion and exposing through the back of one of them). -- -- Richard Knoppow Los Angeles, CA, USA |
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