8K Fiber Optic HDMI Cable 82ft/25m, Detachable Long HDMI 2.1 Cable with Dual Micro HDMI Connectors, 8K@60hz 4K@120hz, HDCP 2.3 2.2, eARC, HDR10, 48Gbps Ultra High Speed

I needed a long fibre optic HDMI cable for an event in our village hall, but the standard HDMI plug would have been a problem getting through some cable routes, so the removable microHDMI-to-HDMI adapters on each end were exactly what was needed, and of course enables direct connection to a microHDMI connector device. To complete the picture, a pair of micro-to-mini HDMI adapters would have been useful, as one monitor I have uses miniHDMI. The other useful extra would be a cable reel, as unlike copper cables, optical cable doesn't twist, so needs to be rolled up rather than wound up.

The mini hadmi adapter is great to get it down conduiting like I have. However, there are issues with enabling all the full hdmi2.1 bandwidth specs. I see occasional black screens running at 4k 144hz with HDR and VRR, and similar at 4k 120, and sometimes the connection gets colours really messed up (image attached). I have a 3080 as the source, and a Samsung s95c, both full HDMI2.1 - and no issues if I use a certified cableThe biggest annoyance is the loss of audio, which happens every few minutes when using digital signals like Dolby Atmos.I'm not sure this is actually HDMI2.1 Certified as I had thrown the box away before I set it all up (pulling it through conduits)I'd go for a shorter length next time in hopes that it solves the signal degredation issues I've seen. (40 meters)It's a shame as it works 98% of the time, but you really need a cable to work 100%