This unique prototype is the solution to a well-known issue of the Sigma 105mm f1.4:
The lens has no mechanical hard stops, which often makes working with follow-focus motors imprecise and frustrating.
Our specially developed focus ring solves exactly that.
The ring features precisely integrated hard stops at both focus endpoints. This makes the Sigma 105mm f1.4 behave as if it had real mechanical end stops — ideal for follow-focus motors.
Features
Compatible with Sigma 105mm f1.4
Integrated hard stops for exact focus endpoints
Works perfectly with electronic and mechanical follow-focus systems
High-quality 3D print made from durable material
Even, smooth clamping
Calibrate once — enjoy absolutely reliable focus travel
One-of-a-kind prototype
Why this prototype is special
This ring was developed as a practical solution for professional productions and tested in real-world use. Thanks to the hard stops, you can engage your follow-focus motor at any position, calibrate it, and the motor will instantly recognize the precise limits — just like working with a true cine lens.
Note
This is a functional prototype from our development series. Appearance, feel, or material may differ slightly from the final production version. It has not yet been tested with all available follow-focus systems. If your motor is not compatible, a tailored replacement will be provided.
