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Re: [OM] Re: olympus-digest V2 #3673

Subject: Re: [OM] Re: olympus-digest V2 #3673
From: Garth Wood <garth@xxxxxxxxxxxxxxx>
Date: Mon, 21 Oct 2002 07:37:12 -0600
At 01:13 PM 21/10/2002 +0000, you wrote:
The light inside may be off for your shooting. Florescents tend to add a green
tint to pictures. There is supposedly a filter you can get to balance the
light, and since you intend to shoot high speed with fast glass, you can get
away with it. I don't remember off-hand which filter, but I'm sure if you ask
around you can find out.


You can also do somewhat more subtle balancing by combining filters. Here's a rough guide:

Warm white type (flourescent bulbs have a subtle pink-purple tint):
Use 40 magenta & 20 cyan when shooting daylight film. Filter factor is 2x or 1 stop. Use 50 magenta & 40 yellow when shooting tungsten film. Filter factor is 2x or 1 stop.

Cool white type (flourescent bulbs have a subtle blue-green tint):
Use 40 magenta & 10 yellow when shooting daylight film. Filter factor is 2x or 1 stop.
Use 60 red when shooting tungsten film.  Filter factor is 2.5x or 1&1/3 stop.

The single filters are known as the FL-D (or "FLD") and the FL-W (or "FLW"), and correct, respectively, daylight ("warm") tubes' spectrum for daylight film and white ("cool") tubes' spectrum for daylight film. You may have to do filter combining, depending on the precise type of the tube. These filters appear violet (i.e., "minus green") to the naked eye.

Garth


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