This is because col neg cine stock is preflashed with white light to control/reduce contrast. Same for duplicating film. You can even preflash chrome, still-life photographers used to do it all the time.
Dear William
I have never used this technique with colour neg film, but have routinely done so with transparency film for many years.
BTW whilst pre-flash works well, so does post flash and is my preferred method. This different method has far greater operating flexibility, because you do not have to prepare your film pre-shoot.
You shoot making the necessary allowances for exposure based on your own experimentation, and then alter contrast to the degree the shoot required back under full control at base. If you are working on sheet film this can be on a by shot basis more easily than if you are shooting roll film.
Hope this is of interest to someone!
Cheers
Richard -- Special rates for top quality drum scanning that is not time critical. See Labs section at www.prodig.org (and email for pdf) or ring +44 (0)1873 890670 =============================================================== GO TO http://www.prodig.org for ~ GUIDELINES ~ un/SUBSCRIBING ~ ITEMS for SALE
