Would not the 'ideal' bandpass filter vary from lens
maker to lens maker? (and possibly from lens to lens?)
It seems like the film also would add to which was the
ideal band pass.
I suppose for architecture, you would use a B&W film. I
found some astrophotography sights that use bandpass
filters, and apparently use color film.
Band pass filters are used in astronomy for both viewing and
photography. They are designed to pass narrow bands of light emitted
by ionized gases in things like emission nebulas. There are also
filters designed to block atmospheric reflection of street lighting.
They allow the seeing of dim objects that would be masked by brighter
objects or background in the field of view. Lots of astrophotography
is false color anyway so it is not strange to combine color film and
filters.
I had never heard of the use of band pass filters with B & W
photography. Sounds like it carries filtration to a more
sophisticated level. I would guess that they would have less effect
on a good lens like an APO which brings the whole spectrum to a
single focus point.
--
Winsor Crosby
Long Beach, California
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