Canon Community Canon Community

New Contributor
Posts: 1
Registered: ‎02-09-2017

Locking EF Mount upgrade for C300

I want to use EF Canon cine-primes but haven't had good luck on a "vanilla" C100—motorized follow focus units torque the lenses too much causing them to shift in their mounts. I'm assuming the C300 with a locking mount would be more robust.


Does anyone know if an EF-mount C300 can be upgraded to locking EF mount in the USA?

Or preferably, can a C300 mkii be purchased direct from Canon already upgraded?


I read the upgrade can be performed in the UK.






Respected Contributor
Posts: 1,076
Registered: ‎10-17-2012

Re: Locking EF Mount upgrade for C300

Hello Eli_fleming, 


The EOS C300 Mark II can be upgraded at the factory service center to the locking EF-CL mount but not the original EOS C300.  

If you ordered an EOS C300 Mark II and wished to have it upgraded, the cost breaks down as follows: 

Cost of first time modification

1.  conversion kit cost = $1,670

2.  labor cost = $500

The mount we take off the camera is reusable, so those parts are returned to you.  Shipping charges are not included. 

Did this answer your question? Please click the Accept as Solution button so that others may find the answer as well.
powered by Lithium

LIKE US on Facebook FOLLOW US on Twitter WATCH US on YouTube CONNECT WITH US on Linkedin WATCH US on Vimeo FOLLOW US on Instagram SHOP CANON at the Canon Online Store
© Canon U.S.A., Inc.   |    Terms of Use   |    Privacy Statement