- Posts: 2
- Joined: Mon Oct 18, 2021 3:23 pm
- Real Name: Hermann Noll
Hello,
I have bought a Blackmagic Micro Studio Camera 4K with the intention of doing shots where amongst other the focus would be controlled by a PC (which also post-processes the video for live display). The S.Bus seemed to be the best solution for this as there are multiple posts of people who managed to at least control the focus smoothly over S.Bus with an Arduino (although I have also seen one project claiming success using a .NET app on a PC).
I even got myself an original Futaba CIU-3 (so USB -> S.Bus) adapter which presents itself as a serial port to a computer to send the commands.
My problem now is that no matter what I try only the three least significant bits change the focus at all (over the range) but 8 stops of focus is of course way too less to be useful. In the process of trying things out I have
- updated the camera to 4.7.1
- used two different bit packing algorithms (one from the arduino BMC_SBUS library)
- sweeped the entire 11-bit range keeping the first three bits the same (focus stayed the same)
I have not seen any post describing a similar behavior and it seems to be directly reverse to what a Blackmagic staff (viewtopic.php?f=2&t=67024) said.
Could it be the lens I am using? (only available to me is a Olympus M.Zuiko 8mm, but in an article multiple Olympus lenses were recommended for smooth focus using S.Bus)
Am I missing some other error source and how would I debug that?
I would be very grateful for any advice you could give me with this problem.
I have bought a Blackmagic Micro Studio Camera 4K with the intention of doing shots where amongst other the focus would be controlled by a PC (which also post-processes the video for live display). The S.Bus seemed to be the best solution for this as there are multiple posts of people who managed to at least control the focus smoothly over S.Bus with an Arduino (although I have also seen one project claiming success using a .NET app on a PC).
I even got myself an original Futaba CIU-3 (so USB -> S.Bus) adapter which presents itself as a serial port to a computer to send the commands.
My problem now is that no matter what I try only the three least significant bits change the focus at all (over the range) but 8 stops of focus is of course way too less to be useful. In the process of trying things out I have
- updated the camera to 4.7.1
- used two different bit packing algorithms (one from the arduino BMC_SBUS library)
- sweeped the entire 11-bit range keeping the first three bits the same (focus stayed the same)
I have not seen any post describing a similar behavior and it seems to be directly reverse to what a Blackmagic staff (viewtopic.php?f=2&t=67024) said.
Could it be the lens I am using? (only available to me is a Olympus M.Zuiko 8mm, but in an article multiple Olympus lenses were recommended for smooth focus using S.Bus)
Am I missing some other error source and how would I debug that?
I would be very grateful for any advice you could give me with this problem.