pitch size use with RRFF and nikkon 50mm lens

Not really enough information to answer this... but I'll take a stab. If you are ordering a Redrock lens gear, and you have a 50mm f/1.4 lens, you need a size "a" gear.

There is a handy ruler that you can download from the redrock site and print, and then wrap around your lens to determine the diameter around the focus ring.
 
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