Nikon Speedlight SB-29S format_8x10 This particular Expodisc is not

This particular Expodisc is not a disc- it's a big 4x5

It's also a "Macro" in the sense that it has a close-focusing mode that provides magnification to 1:5

And it’s compatible with any Paterson tank

Shockingly few of these lenses were made

Nikon Speedlight SB-29S format_8x10 This particular Expodisc is notThe Nikon Speedlight SB 29S is a macro ringlight compatible with all Nikon cameras, though function will vary: it's TTL compatible with many film SLRs, and can be used manually on the rest. This flash consists of a camera mounted flash controller and a lens mounted strobe device designed to provide even, close up illumination for macro subjects. Includes adapters for lenses with 52mm and 72mm threads and original case.