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Series filters are a type of lens filter that were made in several different sizes or series. Many cameras and lenses from the 1930s through the late 1970 use Series filters. Series filters were an early attempt at standardization where a camera user could use one size of filter on similar sized lenses from different manufacturers.
|Series V adapter for Bay-1, filter, hood.|
The sizes in the series filters are identified by a number or by the diameter of the filter in millimetres (such as series 63 or 93). The number is usually in Roman numerals for integers and in Arabic numerals for half sizes. The series number is often stamped into the mount on their circumference. The progression of the integer sizes is in imperial .
The diameter of the filter for each series is:
Series Diameter (") Diameter (mm) IV 13/16 20.6 4.5 ~ 25.5 V 1 3/16 30.2 5.5 ~ - VI 1 5/8 41.3 VII 2 50.8 7.5 ~ 57.0 VIII 2 1/2 63.5 IX 3 1/4 82.6 X 4 1/2 114
- Warren, Bruce, 2001, Photography, Thomson Delmar Learning, ISBN 0766817776.
- Filter_(photography) at Wikipedia, this page incorporates material from the Wikipedia page on Oct 2, 2006