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Discussed by Ansel Adams in The Camera (either
edition), the most useful photographic
tool I have is a small card with a hole in
it. I have one each with a square hole, a
"Minox" hole, and one with a 35mm or 6x9
hole.
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Another AA contribution, an
indispensable tool for locating tonal
relationships and mergers, is the Kodak
Wratten gelatin filter No. 90, The 50mm x
50mm size is CAT 149 4871.
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Combining the two makes a simple and
effective tool for evaluating scenes in
B&W photography. Commercial versions,
from Zone VI Studios, are available from
Calumet Photographic. Use
"zone vi viewing filter" as Product
Keywords in the product search.
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