Franckfc92 wrote:No, it's a peaking function or something like that to help you to focus, not an auto-focus. It's true that the name of this button can make confusion.
On page 15 in the BMCC user manual it says:
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Focus Button
The focus button allows you to sharpen the images without affecting your recorded picture, as it creates a peaking edge around the sharpest part of the image to confirm focus.
To turn on, press the FOCUS button located near the top-right of the touchscreen.
The FOCUS button turns on focus peaking which highlights the edges in your scene which are in focus and helps you get accurate focus when using manual lenses.
Focus Zoom - Double Tap
Double tap the touchscreen display to zoom in to the image to help you adjust focus at the 1:1 pixel scale. Double tap the display again to zoom out.
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You can download the BMCC user manual PDF here:
http://www.blackmagicdesign.com/support/