That board looks a lot like the Mackie.. I use an old 16 channel one for live sound many Sundays. I used to have the Nikon 50/1.2 AIS back in the 90's but decided I like autofocus for the smaller format and sold it for more than I bought it for. Send your sigma 300 in for repair; I had a sigma lens once that didn't cooperate right electronically when I upgraded camera bodies and they fixed it gratis even out of warranty.
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