 Mary K. Stewart |
Filter Diameter I have purchased the Canon EF 16-35mmf/2.8 II USM lens. I want to purchase a couple filters for it. In the specs it says 82mm, P=.75mm/1 filter. So my question is, do I look for size 82mm? I was not sure what the P=.75mm/1 means.
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- Gregory LaGrange Contact Gregory LaGrange Gregory LaGrange's Gallery |
You look for 82mm size filters. But you had me curious to what the P= stood for. Turns out it's thread pitch. It's the distance between one thread to another on a screw. So the thread pitch of anything that gets screwed on to something(filter) has to match whatever it is that it's getting screwed on to(lens). Also turns out that most Japanese photo gear makers use a standard of .75mm, so just about any modern screw on filter will fit a modern lens. But if a filter is really old and isn't metric, it isn't going to fit. I bet you'd probably find that lenses and filters for different formats(35mm, medium format, large format) have different thread pitches.
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Mary K. Stewart |
Thanks for your help!
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Lynn R. Powers |
Greg- You lost your bet. I own a Bronica SQ-A. The "normal lens" is an 80mm f8 Zenzagon PS. It takes a 67mm filter. I purchased some new filters and the filters fit this lens as well as a Canon EF-S 17-85mm f3.5-5.6 and the Canon EF 70-200mm f4 L IS without any adapters. Come to think about it when I had an Ashi Pentax 1a and the the old Bronica in the mid '60s I had one lens for the Pentax that required the same size filter as the Nikor f2.8 80mm that came with the Bronica. My Linear Polarizer fit both lenses.
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