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I'm using a 5D III with a SanDisk Extreme pro 64GB, but quite often the recording stops due to the card not being able to keep up.

Everything I've heard about CF cards has pointed me to this one, including posts on the forum. If I can't get reliable results on this, what should I be using? I'm not recording audio and I'm using 12 bit lossless.

I've always read that having an SD installed in the 5D III brings the speed down dramatically. Is this still true with booting ML from it?

Will I have the same burst rate performance as without an SD, just with the added benefit of being able to quickly remove the SD and disable ML?

Cheers

I've got a SanDisk 'Extreme' 64GB with a quoted 120MB/s, which I assume is the read speed.

I can barely write 1080p 14-bit to this card, when I was hoping to do 3.5K! Seems like I've got about 80MBps write speed...

Is this what I should expect? And which card should I buy if I want to write 3.5k?

Thanks

I'm trying to write a little helper script to switch between AF modes using a key on the camera, preferably the DoF preview key or AF-ON.

Is there a way to access these keys or? They're not listed in the lua script documentation...

I'd like to toggle from one shot (with expansion) and AI servo (set point then tracking) using a key, but it seems impossible in the canon menus.