Contact Chuck Davis. They were friends and dove together up to about his last year.
Yes. Bob designed it around the Nikon F when he still had the Anchor Shack dive shop in Hayward, California. The Cannon F1 also fit with a few modifications. The reason these two cameras were chosen is they both had large viewfinder optics available as an option.
Rambling stuff that may be of interest:
The best viewfinders were on the Rolliemarin with large a prism angled up at about 45°. That prism was used or copied on several Hasselblad and Bronica large format housings that followed. Even though the Rolleimarin was the first commercial camera housing produced, it still has the best ergonomics and most elegant design of any housing I have seen. Too bad the twin-reflex Rollei was soon eclipsed by the single reflex cameras. Still, you have to marvel at the design quality for a brainchild that began in the late 1930s and was finalized in the early 1950s.
Bob Hollis did quite a few Rolleimarin housing updates by replacing shaft seals with modern O-ring glands, adding EO connectors to sync strobes, and replacing some of the gum-rubber gaskets with O-ring seals. You might be interested in the history of O-rings in O-rings for Divers. There's a photo of my Hydro-35 in there. You can see that the original housing wasn't designed for the Cannon because the F-stop control machined away some of the cast letters of the name.
A few hundred but mostly technical stuff of the Bathyscaph Trieste II and Mark II Deep dive system. I have posted a few on ScubaBoard when it was relevant. I posted yesterday: What’s the best photograph you've taken whilst scuba diving?, Post #18. I have a few from school but not as many as I should have taken.
Nice housing! It looks like it’s held up quite well after all these years!
The Rolleimarin is one of those sought after items in both the photography and vintage scuba collector groups. I believe the housing is actually worth more than most Rolleiflex and Rolleicord cameras.
The photo you posted is very eerie. How did your Nikonos camera hold up at the depth?! 950 feet certainly is deep, much deeper than the 200 feet the Nikonos was rated to! Did you use the Nikonos in another housing? If you have anymore neat photos from your time in the navy, feel free to post them here