Nikon Speedlight SB-400 lens mount_Canon RF Soviet-made lens filters made for

Soviet-made lens filters made for a mirror telephoto lens

The Leitz Canada Elmarit-R 19mm f2

but the size tradeoff is maybe worth it

It has a convenient accessory shoe for a viewfinder (viewfinder not included) and a 1/4" threaded tripod attachment point on its base

Nikon Speedlight SB-400 lens mount_Canon RF Soviet-made lens filters made forThe Nikon SB 400 is a nice, compact TTL flash compatible with modern Nikon DSLR and mirrorless cameras. It features a tilting head, an on off switch, and that's about it. Compact, lightweight, and unobtrusive, this is a great little flash for everyday use. In excellent condition, with softcase.