Filters vary according to the actual density of the filter but the
exposure factor for an orange filter is probably about 4. It may be
written on the edge of the filter.
A filter factor of 4 means to increase the exposure time by 4. The
number of stops is the square root of 4 or 2 stops. If the indicated
exposure was 1/500th at f/16 you could shoot at 1/125 at f/16 or 1/500th
at f/8.
Chuck Norcutt
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?
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