> I am confused by color separation filters. What are the filters needed for
> separating Ektachrome to b/w negatives? I have heard combination 25, 47, and
> 58, but when I checked KODAK's catalog, it shows combination 29, 47, 61 as a
> set; but it also has 25, 47b and 58 listed as "color separation and tricolor
> work." It doesn't say that the latter 3 form a combination though.
>
> Also, are filter numbers pretty standard? If I buy filters from other
> manufacturers with the same numbers, will those be the right ones for
> separation? In another catalog I see Lee Tri-Color Filters, and it has #25,
> 47B and 58 as a set. Tiffen also has #25, 29, 47, 47B, 48, and 61, same
> numbers as KODAK's. I don't know if they are the same thing though.
>
> Are gelatine filters ok to be used with enlargers? I have a Beseler Universal
> 45. It is a color enlarger, so it doesn't have a filter rack before the
> diffuser. I can place the filters below the lens, but are these gelatine
> filters optically good or will they degrade the image?
>
> Thank you very much in advance!
>
> Dave S.
>
>
From what I remember there's one set for shooting with the camera
and a different set of filters for making the dye transfer
separations, for example. The filters have different Wratten numbers.
Ed M.