Late on this response, but the big downside to the aftermarket olpf for the Ursa Mini is that it will void the warranty and BMD will not service the camera.  They’ve confirmed this on their official forum here:

https://forum.blackmagicdesign.com/viewtopic.php?f=2&t=89556#wrapper

I suspect that this is just the usual incompetence on the BMD's side.

I have here an unlucky 4K6 URSA, that has somehow forgot its serial number and sensor calibration (either the EEPROM memory failed or its connections, or just the checksum is incorrect due to a flipped bit). The excuse to not service this camera from BMD was:

    We are unable to read the serial number and our tools can not deal with that.

Seeing such answer, one should assume there is no real service. Its either a replace if fails within warranty, or your gear belongs to trash.
Bigger the company, less care they provide.


Ing. Daniel Rozsnyo
camera developer
Prague, Czech Republic