This is a genuine Hasselblad linear polarizing filter for lenses with B70 filter mounts
The Nikon TC-14E II is an autofocus teleconverter designed for select Nikon AF-S telephoto lenses (here's Nikon's compatibility list)
and the like – it is not water-proof and cannot be used underwater
The Minolta Hi-Matic AF2 is a camera from that transitional period between the manual-focus compact rangefinder era of the 70s and the full-auto point-and-shoot scene of the mid 80s
and a Paul C Buff Cybersync receiver (transmitter is sold separately)
Vivitar A35 quick release This is a genuine HasselbladThe Vivitar A35 is "Splash Proof" but, and you will know this when you hold the camera in your own hands, you should take that with a huge grain of salt. There are gaskets on the battery compartment and the film door, a membrane over the shutter button, and a glass window over the lens, so it's not nothing, but the extent to which those are effective is unclear. Anyway, keep it as dry as you can. Runs on two AA batteries (included.)
