Som Berthiot Pan-Cinor 17.5-70mm f/2.4 C-Mount Zoom

Optical performance

- The lens is praised for its nice image quality, with smooth zoom action throughout the range.

Focusing

- The lens generally holds focus well through the zoom range, though it may require calibration with some camera adapters.

Modern usage

- Today, this lens is a collector's item and is also used by filmmakers and cinematographers seeking a classic vintage film look. It can be adapted for use on modern digital cameras, but this may require special adapters and careful back focus adjustment.

Manufacturer-

 Som Berthiot, a French company.

Lens series

- Pan-Cinor.

Focal length

- 17.5–70mm zoom range.

Maximum aperture

-  f/2.4.

Mount type

- C-mount 

Viewfinder

- Models intended for non-reflex cameras included a side viewfinder that provided a parallax-corrected view.

Zoom control

- A built-in zoom lever provides smooth, dampened zoom operation.