Compare mk1 vs mk2 Changes for Brio rework kit were introduced at 2021-04-18. There were no major changes so initial design was replaced by mk2 version. All changes listed below: Feature mk1 mk2 Connectivity USB-C USB-C lock screws Body features Larger pockets for microphone wires for easier assembly Body features Larger opening for a sensor - allows use of short back-focal lenses with M12 lens adapter Body features Chamfered edges on front panel - small cosmetic change and minor weight saving Body features 0.7mm thicker front plate Weight (aluminum parts only) 43.3g 41.7g