Calypso brand_Mamiya 6G ED AF-S Nikkor is

6G ED AF-S Nikkor is a good quality standard zoom lens for Nikon DX-format digital SLR cameras

but with its front-mounted shutter dial and externally coupled rangefinder

clean glass

non-working Photomic prism

These Paterson graduated cylinders are designed for film processing

Calypso brand_Mamiya 6G ED AF-S Nikkor isThe Calypso is an underwater camera originally designed for Jacques Cousteau and his expeditions. It's the first true self contained underwater camera, which is to say that it's not just a terrestrial camera in a bulky housing. When new, it was capable of submersion up to an impressive 200ft (but please do not try it with this camera today). The Calypso is very small and handles easily, even with gloves. Nikon liked it so much that they bought the