Filter equivalence question

Murray@uptowngallery · Feb 11, 2007

I am wondering if Ilfochrome colors like CP30Y, CP50Y, etc, are the same as anything else like CC's, MIRED's, etc.

I have a set I won't use for the intended purpose and wondered if it amounts to a free set of 'gel-type' filters I can use for alternative use.

Thanks

Murray

Murray@uptowngallery · Feb 12, 2007

Found an answer in a Kodak doc. :

CC = color correcting
CP = color printing

CP filters are same colors except made of acetate & not recommended for image forming (presumed to mean 'taking') if highest quality is desired.

So they're not even unique to Ilfo/Ciba process...just the name on the box.

Lee L · Feb 12, 2007

Murray@uptowngallery said:
CP filters are same colors except made of acetate & not recommended for image forming (presumed to mean 'taking') if highest quality is desired.

And also designed for use above the negative when printing, not below the lens or in the image forming part of the light path.

Lee

RalphLambrecht · Feb 12, 2007

Lee L said:
And also designed for use above the negative when printing, not below the lens or in the image forming part of the light path.

Lee

Clean under-the-lens filters have never caused a visible quality loss in my experience.

Murray@uptowngallery · Feb 13, 2007

I agree (both of you). I had been reading about filtering light sources for other applications & am thinking about some b/w experiments with filtered flashes.

Thanks

Murray

Lee L · Feb 13, 2007

Murray@uptowngallery said:
I agree (both of you). I had been reading about filtering light sources for other applications & am thinking about some b/w experiments with filtered flashes.

Thanks

Murray

Murray,

They will obviously work for filtering flash. If you're going for really saturated colors/shadows, you'll probably end up wanting something like Lee or Rosco theater gels with stronger or more saturated colors than CC or CP filters. My guess is that the effect will be a little subtle unless you're just trying to color balance the flash.

I'm not surprised that high quality CP filters perform well under the lens for Ralph and others. I've seen some that wouldn't do well in that application, especially when stacked up 4-6 filters deep as some color printing might require. Unless they're Microsoft or Apple brand filters, you're probably not even violating the EULA by using them under the lens or in front of a flash.

Lee

Murray@uptowngallery · Feb 14, 2007

I was going to do some experiments with flash and a zone plate to see what it looks like with reduced-chromatic light, see if it looks more like pinhole or what happens. It was calculated w/550 nm (yellowish green I suppose).

With pinhole or zone plate I wouldn't be able to see any optical flaws :O).

They look better than many of my Series VI filters that are wrinkled now...only reason to use those is for a toy camera look I guess...

RalphLambrecht · Mar 31, 2012

they don't

Filter equivalence question

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