According to "the Kodak Workshop Series, Using Filters" [ISBN
0-87985-751-X], the filter factor for a #21 orange filter is 5 in daylight
and 4 in tungsten light. These two filter factors convert to an increase in
exposure of 2 1/3 and 2 stops respectively.
jh
----- Original Message -----
From: "Moose" <olymoose@xxxxxxxxxxxxxxx>
To: <olympus@xxxxxxxxxx>
Sent: Saturday, 11 March, 2006 06:33 PM
Subject: [OM] Re: Color Filter Metering B&W Shooting
> Michael Wong wrote:
>
> >Dear all,
> >I wish to take B&W shooting with my Olympus 35SP. Unfortunately, it is
not
> >TTL metering. If I put an orange filter in front of the lens, how many EV
> >should I adjust?
> >
> >
> The filter factor for orange is generally about 4. That means you need 4
> times the exposure.
>
> That's an increase in exposure of 2 EV, which actually means acting as
> if the brightness is 2 EV less. So if the meter reads EV 10, you use the
> camera setting for EV 8.
>
> Another way, less confusing to me, is simply to divide the film speed by
> 4 and set that value in the meter while using the filter, then simply
> set the camera to match the meter.
>
> If you search the web for black and white filter factor, you will find
> lots of reference pages. One that's fairly comprehensive is
> <http://www.jackspcs.com/filters.htm>.
>
> Moose
>
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