topic Re: Can't Register LUT in C300 Mark III in Professional Video

Can't Register LUT in C300 Mark III

San2C — Thu, 12 Jun 2025 13:37:51 GMT

I can't seem to register LUTs in this camera. The "register" option and everything else on that menu is grayed out. And yes, I have .cube LUT files on the formatted SD card.

Thanks for any help.

Re: Registering LUT in C300 MKIII

Mark35mmF2 — Thu, 29 Apr 2021 12:57:10 GMT

Hi there,

Just wondering, in case it might have an effect, did you create the LUT you are trying to load or was it downloaded from somewhere. And do you know if it was generated for the camera using DaVinci Resolve?

Re: Registering LUT in C300 MKIII

San2C — Thu, 06 May 2021 15:18:49 GMT

I got the LUT folder from the Canon website. They seem to be broken down into 3 groups, but not sure what "65grid," 33grid," and "17grid" means. I did manage to regsiter one of them.

Re: Can't Register LUT in C300 Mark III

canonuser12 — Sun, 02 Nov 2025 19:19:27 GMT

Did anyone find a solution to this issue? I'm having the same problem with luts downloaded directly from canon.

Re: Can't Register LUT in C300 Mark III

CharlesTeton — Tue, 13 Jan 2026 16:28:14 GMT

Have you tried loading them on your proxy SD card? Canon's 33 grid are the ones to use, even the new Canon 709 & CMT 709 LUTS should load. I don't have C300 MK III but C700 FF. LUTS should be at the root level, like in screengrab. Hope this helps? Charles

https://hk.canon/en/support/0200747702

Re: Can't Register LUT in C300 Mark III

canonuser12 — Wed, 14 Jan 2026 00:15:55 GMT

The problem was I was trying to load the 65grid lut instead of the 33grid lut. ChatGpt told me (even argued with me) that the 65grids are compatible with the camera. After trying over an hour, I asked Gemini and it told me the 65grid isn't compatible with the camera and to use the 33grid lut. the 33grid worked the first time.

Re: Can't Register LUT in C300 Mark III

CharlesTeton — Wed, 14 Jan 2026 01:03:21 GMT

Glad you got it sorted... To be honest I don't use ChatGPT or any 'AI', as the data is just scrapped from other peoples work, conversations, forums, papers, etc and then ranked and not all that accurate. I generally search forums/reddit etc. but pretty sure the answer was in the manual or Canon's own help docs on this one, when I was looking initially for myself.