The original filters are indeed marked 47, not 47b. As it is a one-shot, I can not give blue more exposure than the others unless I start adding ND filters in the red and green path.
Ok, let's take this a bit further. Right now the filters are some non identified material that is sandwiched between 2 glass plates. Don't know what happened to it, it looks like it is delaminated (which sounds plausible after 70+ years). I guess it is a gelatin filter. The LEE filters are thin polyester ones, so I'll need to make a support for them. Right now I was thinking of making a little frame to clamp them between. Another idea was to glue them to a thin glass plate but only a single one. No idea how I'm going to avoid bubbles in that case. I'd like to find a way not to have to glue to the filters.
IF I could find massive glass filters I'll take them but so far I haven't been able to find any. I cannot even find massive polycarbonate ones.
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