We all know bw still shooting is indeed a thing but what OP was asking about was video, which is a lot harder for bw and in general imo.
I know of at least one well know bw photographer that used a 60mm with APS-C for stills. I have used from 50 to 100mm with full frame DSLRs for my bw shots. You can see the lens used in the exif data on my website pix by clicking on the tiny dot with the i in it next to the buy button (this is Smugmug styling). These bw shots are mostly in my invertebrate gallery (under Aloha!) but there are a few in the fish portrait gallery as well.
The main downside of the 100mm lens IMHO is when you get a large creature like a big jelly - one of the vids above showed a large ctenophore in front of a diver that I have seen as well - I ended up just getting close-ups of part of it using a 100mm. Most of the stuff is much smaller, e.g., 1 to 2 cm length or diameter. One can use either lens (normal or 100). And there is smaller still - the dots you see moving around in the vids: copepods and amphipods.
On my most recent HI trip I used a D3X with a 60mm AFS lens (Canon does not make a counterpart as their 50 is rather old and does not allow switching between MF and AF within one dive which is one reason I favored the 100 with C). Even with the 60 I was not able to get an entire box jellyfish in the pic (see my gallery header shot). Keep in mind I was shooting stills and using an OVF. Shooting vids with a back screen is going to be a different experience. The vids I have seen being shot were with rather small housings or a Gopro so short focal lengths were used (i.e. small format cameras).
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