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B40 Filters vs Bay IV Filters

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RoboRepublic

RoboRepublic

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Hi everyone- I'm familar with rolleiflex bay i, ii, iii et all, however I'm curious to know what Bay 40 or sometimes labeled as 'B40' filters are? They come with the same three prong bayonet on the mount side and I'm wondering if B40 and Bay iv are identical?
Thanks for the education!
 
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