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medium format lens entrance pupil data

Distance to entrance pupil measured from front of lens without hood using a digital caliper, a panning head and a vertical laser line focused on the minimum aperature. Please email me if you have additional medium format or Mamiya nodal point (incorrect term but often used) data to add to this chart, which I created for the benefit of fellow panorma photographers stitching wth medium format lenses.

  • Mamiya 65mm L-A KL: entrance pupil 43.5mm from front of lens (approximately 65mm from mounting flange)
  • Mamiya 65mm f4.5 Sekor C is 140.5mm from the film plane, for infinity focus. (From Joseph Wisniewski here.)
  • Mamiya 90mm f3.8 Sekor C: 148.5mm from the film plane, for infinity focus. (From Joseph Wisniewski here.)
  • Mamiya 127mm KL: entrance pupil 59.25mm from front of lens (approximately 20mm from mounting flange)
  • Mamiya 210mm KL APO: entrance pupil 92.25 from front of lens (approximately 30mm from mounting flange)



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