I'm doing a multi camera shoot with 2 x 5d Mk IVs, 1 x 5D Mk III and a 6D. It's a low light shoot and I'm shooting at 25fps. I know I'm supposed to set the shutter speed to double the frame rate i.e. 1/50th, but I want to use 1/25th so I can keep my ISO as low as possible. I can set the shutter speed to 1/25th on the 5D Mk IVs but not on the 5D Mk III or the 6D. Why is this not possible and am I missing something?
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