Based on active locking mount of EF II series adapters, the whole new EF 3 Mounting Adapter with e-ND is designed in accordance with traditional DSLR lens rotation method but with much improvement.
Compared to the previous version, EF 3 Mounting Adapter with e-ND not only possesses the traditional way to rotate the lens clockwise, but also keeps active locking to fasten the lens, thus the EF lens can be installed quickly and locked clockwise as the PL lens, which is suitable for the utilization of Follow Focus when shooting.
The EF Mounting adapter with Built-in Electronic ND (e-ND) employs high-precision hybrid of liquid crystal material, optics and electronic technology.
It covers a wide range from 0.6 to 2.1 (2 stops to 7 stops).