Control focus via Bluetooth

Hi there,

I'm developing an electronic device to control my BMPCC 6k via Bluetooth. Aperture, shutter, ISO and so on work quite nicely. Relative focus and instant AF work as well. But unfortunately I am unable to set an absolute focus position.

The reference manual (camera control - developer information - Oct. 2018) states that I can set the focus using ID 0.0 and passing the focus as a fixed16 data type (being 0.0 = near and 1.0 = far). However doing so the camera does not react. Not at all. The only way I can change the focus is relative to its current position.

I tested with different lenses, original Canon and other manufacturers. No luck. What do I have to do to set an absolute focus position? Is it possible at all?

Best regards,
Wolfgang

[Brendan Dower]

Hi Wolfgang,

Unfortunately, this is a limitation of the lens itself and not something that we can change/implement in the camera.

• EF lenses (used for the BMPCC6K) use relative focus position only.
• MFT lenses (used for the BMPCC4K) use absolute focus position only.

Thank you for your answer, Brendan! You saved me a lot of time.