Blackmagic Forum

Hello all,

I have a subsea camera, set to output HD (1920x1080, 30 fps) video directly through fibre. I have a computer with a Magewell ProCapture SDI.

I'd just like to be able to bridge the two. I bought a MiniConverter Optical Fiber 12G and a 12G optical module, but it doesn't work.

I don't know anything about these things, my guess is that I just have too many G's?

Should I have got the 3G optical?

Have I got everything completely wrong?

Any assistance appreciated so I don't blow more money on the wrong thing

Thank you!

Do you have more details about the camera you are using? Like a brand or model information? Then perhaps we can figure out what it is trying to output.


The 12G will work for everything that the 3G one does as well.

It's a subcimaging rayfin.

Capable of 4K, but I have it set to 1920x1080 30 fps as it currently runs through a fibre to HDMI converter which is only HD (this works fine btw).

I can't find any more detailed information though it does use CWDM but it demuxes so that should be fine.
Are you using the correct fiber input of the SFP? It should be the one on the right.

Perhaps the easiest course of action to get it going for now is to get a Blackmagic HDMI to SDI converter (59$) and just go camera - fiber - HDMI - HDMI to SDI - Magewell with the existing working HDMI converter.

I'm definitely using the input side. I thought the SFP might define the SDI output, so the 12G one is creating a 12G channel, so even though the data rate is low enough for 3G, it is still a 12G output that the video card can't read? Anyway, I would have liked one device to do the task, but I'll take your suggestion and get a HDMI-SDI converter. Thank you for the help

I took a look at the specs, seems the cam outputs IP over fiber, that’s not the same thing a video over fiber. You need an ethernet fiber solution not SDI. It appears that some models have coax for SD or HD but the fiber connections appear to all be IP.

You probably just need an ethernet switch with a fiber SFP and the Rayfin Control software. Doesn’t look like the Magewell, or Blackmagic devices are necessary.

You say that it works with fiber to HDMI, is this an RTSP to HDMI device?

Good Luck