Birns & Sawyer Zoom Combifinder Model K eyepiece The pin is definitely an

The pin is definitely an F4

An uncommon classic in nice shape

In excellent cosmetic condition

stepless aperture control for use in followfocus systems

for many CF-type lenses

Birns & Sawyer Zoom Combifinder Model K eyepiece The pin is definitely anThe Birns & Sawyer Zoom Combifinder Model K is a director's viewfinder for standard 4: 3 format 16mm and Super 35mm. A handy accessory that lets you quickly get a feel for the field of view of lenses from 18mm 150mm (in Super 35 format) and 8mm 75mm (in 16mm format). Also very useful for looking like an important person who knows what they're doing, if you're in the right crowd. In excellent condition. Includes neckstrap.