Nikon PK-3 lens mount_Pentax 67 but it does have two

but it does have two selectable apertures and a built in close-up diopter

with smooth focusing and a well-damped stepless aperture control

The bag is structurally sound

8 CB Planar lens

This Metabones adapter allows Nikon F mount lenses (with or without an aperture ring) to mount to Sony E mount cameras

Nikon PK-3 lens mount_Pentax 67 but it does have twoThe Nikon PK 3 is a 27. 5mm extension tube for manual focus F mount lenses. Will mount to any F lens and body, but transfers aperture information via old school pre AI bunny ears, so depending on your camera and or lens, you may need to meter stopped down on this one. In good working order, with minor cosmetic wear.