Hello
I am building a 5 x 7 colour enlarger and i plan to use a technique that phillip s used in their PCS 130 enlarger, which had RGB lamps which varied in intensity to control colour. The filters were dichroic. Only one exposure was required.
From what i can understand, the reason that primary colours were not used by the public for printing when using one white light and filter packs is that by usin g a set of RBG additive filters, the first filter would block the other two colo urs from reaching the next filter in the pack, so therefore the subtractive proc ess was used. However you could do three seperate exposures, red,green, and Blue when using the additive system, too time consuming for the general population.
My question is would there be a specific bandwidth of filter for red green and b lue for my three colour enlarger so that all colours would be availiable, or not ?. Could i just use coloured gels that they use in theatre spot lights?? also, i s the only benifit of dichroic filters be freedom from fading (ie increased repe atability and life?)
Any thoughts would be appreciated
Thanks,
Phil
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