The Dictionary Of Photography

A True Historic Record Of The Art & Practice Of Photography 100 Years Ago.

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Exposure
above tabular matter; but in addition we may here give the following: -
Table Showing at a Glance the U. S. No.   for All
Diaphragms. (See article Diaphragm for   the new
standard of the Royal Photographic Society,   based on effective focal aperture).