Switching between "4K 50 fps" and "4K 100 fps" (yes, PAL) is quite some work and not handy when on a shoot.
Any idea how to switch fast without using custom modes (C1 C2 C3)?
BTW: Not using custom modes because if you switch to another custom mode, also the shutter speed, aperture and the ISO is changed to its default settings.
I assume that you already have the video system set to PAL in order to use these frame rates. The image quality/resolution or frame rates is not something that you can customize a button for in Movie recording like you can for still shooting, unfortunately. Using the Custom modes may be your best option.
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