Lens controller: Pinefeat CEF
The Pinefeat CEF135 M42 adapter mechanically couples the Canon EF lens to
the instrument camera and provides electronic focus and aperture control. It
connects over USB as a serial device; the instrument control software operates
the controller through its instrument-side focus backend.
Operational notes
Disconnect USB power before connecting or disconnecting the lens.
Ensure the mechanical switch on the lens body is set to
AFto enable electronic focus control.Calibrate the focus travel for the attached lens before adjusting the focus position or aperture setting.
Canon EF lenses do not report their current aperture, so aperture commands are effectively write-only.