Nikonos Speedlight SB-105 brand_Leica This accessory lets you shoot

This accessory lets you shoot 24x60mm panoramic images on 35mm film with your Mamiya 6

and the 1988 F4 (although its label here is a duplicate of the F3's caption)

but if that weirds you out

Includes mount cover

Nikonos Speedlight SB-105 brand_Leica This accessory lets you shootThe Nikonos SB 105 is a large, bracket mounted underwater flash for use with the Nikonos series of cameras. In excellent condition, with bracket and connecting cord. You can use it in or out of the water, of course, but it's worth noting that our warranty does not cover water damage. Sorry to end this description on a downer! Flash works great in our dry land tests, though.