Sony A7R IV bulb The 285 will mount and

The 285 will mount and fire to any film camera with a standard hot shoe

so be sure your camera and head have the right fitting

The Kiev TTL Prism is for Kiev medium format cameras and is also compatible with Hasselblad viewfinders

Other cameras have more reach

This is a chrome Hasselblad A12 6x6 back

Sony A7R IV bulb The 285 will mount andThe Sony A7R IV is a mirrorless camera with a 60mp full frame sensor and 5 axis stabilization built in, which is pretty impressive, I think. It shoots 4k video up to 30fps, and 1080p up to 120fps, with HLD and S Log2 & 3 support. In excellent condition, with under 1500 actuations. Charges via standard USB C or USB Micro cable (not included.) Includes battery and strap, though.