CLM-4 spin too fast

[Helmi]

Hi,

I have an issue with my CLM-4 motor. It spins very quickly when doing its focus range from minimum to infinity, then keeps spinning endlessly. I tried the motor with another WCU-4 and UMC-4, and it did the same thing.

If anyone has experienced this and can give me advice, it would be appreciated.

Thank you!

[Jan Heugel]

Dear Helmi,

how can it spin indefinitely, when there should be hard stops on your lens? You cannot use the system with photo lenses that are decoupled from the focus-ring (because of the internal autofocus motors; Canon EF lenses for example).
Can you share a photo of your setup?

Thanks,
Jan