My dad has invited the family on a 7-day cruise to Alaska, and I'm trying to set up my R5m2 for the trip. Looking through various YouTube tutorials, I found one that explains how to set a custom button to instantly switch from photographs to 120 fps video with the appropriate 1/250 shutter speed. This seems especially useful for Alaska, and I don't want to mess with the menus or the still/movie toggle switch to do that.
The bottom line: while in photo-shooting mode, you can touch the red movie-shooting button and instantly record 120 fps video without sound.
I had to watch this video three times before I finally understood what he was doing (his presentation lacks certain details but is generally good). But I got the settings to stick, and here they are. I hope they're all correct. If not, please tell me. If you've seen the video before, ignore this. 
The tutorial recommends setting custom buttons for photos, but I like mine the way they are so I'm going to ignore that part.
First things first
- Put the camera in Movie Recording mode with the left-hand still/movie switch.
- Put the camera in Manual mode with the right-hand Mode button.
- Set the shutter speed to 1/250, aperture to wide open, ISO to Auto
Red Image Quality/Size menu
- Set the Movie Rec. Size to record 120 fps at whatever size you want: 4K-D, 2K-D, FHD, etc.
- The Main Rec. Format must be HEVC (H.265) or HAVC (H.264). RAW does not support 120 fps.
- You can Enable High Frame Rate if you choose. This is redundant, but it does limit the fps to 120 or 240 and it disables sound recording. You can also turn sound off in the next Sound-Rec. Settings menu.
- Under the Color/Tone/Dynamic Range menu, make sure Custom Picture is OFF unless you WANT to record in Canon Log.
Purple AF menu. These can be whatever you want. I'm using:
- Enable Movie Servo AF
- AF area to Whole Area AF
- Subject detection Animals, Eye detection Auto
Yellow File/Card Setting menu
- Set Video to record to the highest-speed card you have (probably CFExpress).
- I'm choosing to Enable the Still/Movie "Separate" mode.
- In the Reset/All Settings menu, enter Custom Shooting Mode.
- Tap Register Settings, choose C3 and then Save.
- The tutorial recommends setting Auto Update Set to Enable, but I'm not doing that. Enable will automatically update Custom Mode C3 if you make any changes while shooting, but I want the settings to remain static.
I think that's all. Assuming this is all correct, this is what happens:
- You're out shooting in still mode using whatever settings you prefer.
- You encounter a situation where you want 120 fps video.
- So you tap the red movie-shooting button.
The LCD should change to 1/250 shutter, wide open aperture, and Auto ISO. It will also display the amount of video recording time your card has left. If those numbers are in yellow, then you know High Speed Video is enabled. If those numbers are in white, the settings didn't stick.
I'm fairly certain this will be advantageous in Alaska, either on the cruise ship or during a land excursion. The best part is that you can leave your camera the way it is for all other settings. And you can use the movie mode toggle switch to capture video with whatever your normal settings are.
I hope this is useful to you! Bon voyage!
[URL unfurl="true"]https://www.youtube.com/watch?v=Cr6PJbggl9c[/URL]
