Archived posting to the Leica Users Group, 2000/01/24

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Subject: Re: [Leica] Re: B+W filters reds
From: Mark Rabiner <mrabiner@concentric.net>
Date: Mon, 24 Jan 2000 18:03:26 -0800

Godfrey DiGiorgi wrote:
> 
> They respond in exactly the same way as other B&W films - Blue, Green,
> Yellow, Orange, Red filters modify the contrast and relative tonalities
> of colors in the subject. The spectral response of the individual film
> (T400CN or XP2, etc) can be found in the technical datasheets; they're
> roughly comparable to Tri-X and other films.
> 
> Godfrey
> 
> >To pose a completely naive question:  what're the effects of filters on
> >C-41 process B&W emulsions?  I looked at Kodak's tech info on T400CN ><Snip> 

I'm gonna say again that there was an article in one of the better photo mags a
few years back on B+W filters and one of them, I think the (light Red) has the
interesting quality of not extremely increasing contrast like all Red filters
seem to do and make for easy to print negs. B+W seem to specialized in making
all kinds of Red filters in a huge variety of spectral cut off points. I see in
the B&H either the dark or light red they are not carrying all ten in stock of
course. I've got plenty of light reds I'm going to check out the dark reds for
those black skies...sounds ok to me!!!:)
Mark Rabiner