filter pitch - RB 67 Fisheye

Discussion in 'Medium Format' started by neil_grant, Jul 16, 2010.

  1. A friend is skimming some non-dedicated 40.5mm filters to suit the RB 37mm lens. He intends to mount these into a threaded stock that can be clamped into the chuck of a lathe - however he is having problems measuring pitch of the filter thread. Presumably these are a standard metric size. Anyone know what it is??
  2. Hi Neil, the RB 37mm. lens' filter thread is 0.5mm. pitch. Most filters are 0.5 or 0.75 pitch.
    There may be some 40.5 filters with 0.75 pitch but I don't recall having seen any - if the filter fits the lens then it's 0.5mm.
    Hope this helps.
  3. thanks, I'll tell him.

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