Re: Filters

[Michel Wurtz - LTE <mw@xxxxxxxxxxxxxxxxxxx>]

Douglas Benson wrote:
> 
> Greetings:
> Has anyone had any experience shooting EIR with other than the recomended
> #12 filter. I have been thinking about trying a #15 and/or #22...any
> thoughts or recomendations?

Yes - I've noticed that #12 results are too blueish for my taste

In a brief, you can try (not fully tested with the new EIR and E6)

an Orange filter (I use the Nikon One) => warmer image (more cyan/green)
a red filter (#25 or #29) => green/yellow/red image
a grenn filter (#55 or #58) => Blue/Magenta/Red image
The nikon (glass) X2 filter (dark green) => Only blue (cut IR ?)
A dark cyan filter (#45 ?) give also only blue,
A dark red filter (#89B) give only red (cut the visible light)

You can also play with Kodak Color Compensating Filters (CC)
I used them to adjust the color balance for skin (so peoples
look natural in a strange environment :).

Color shift are : CCxxB (blue) => more red, less cyan
                  CCxxC (cyan) => more magenta/blue, less green/yellow
                  CCxxM (magenta) => more yellow, less blue
                  CCxxG (green) => like Cyan, but more magenta than blue

My prefered option was a #12 + CC50M + CC30G + CC40C,
or the Nikon (glass) orange filter + CC40G + CC30C

You can play with that as a first base, but if you want reproductible
results, you must have the same "quality" of light : depends on
sun (and camera) position, weather, etc...
You must also have a consistent processing sheme (this is the
reason why pros -- aerial photography mainly -- are using AR-5).
I think E-6 process is too contrasted and give too much red on
the final slide.

And finaly, my dream : a color film with 2 IR layers :
	blue and green eliminated
	red -> blue
	IR (700 -> 850 nm) -> green
	IR (800 -> 950 nm) -> red

Is there an surplus Landsat satelite camera available ? ;-)

- -- 
Michel Wurtz    ENGEES - Laboratoire Territoires & Environnement
                1, quai Koch - BP 1039, F-67070 STRASBOURG cedex
                Tel: +33 03.88.25.34.62  Fax: +33 03.88.37.04.97
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End of Infrared-Digest V0 #509
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