Vocas, manufacturer of great high quality rigs for HDSLRs and other cameras presented new flexible gear rings at IBC that incorporate movable hardstops for follow focusing all those Canon lenses that don’t have an endpoint. A great solution and in most cases a more cost effective method than buying a follow focus with hardstops.
[UPDATE]: (via e-mail by Vocas)
We are planning on selling the rings per 4 or 5 pieces at once, in that case they will cost about 20 euro.
They will be available at B&H soon.
See more details on the Vocas website.