SMC Pentax 645 L.S. 75mm f2.8 center Breakthough Photography calls this an

Breakthough Photography calls this an "X4" filter

with only the most minimal cosmetic wear and under 1000 actuations

The Arca Swiss Monoball B1 is a heavy-duty ball head suitable for

A rare creature in pretty decent shape

but everything works

SMC Pentax 645 L.S. 75mm f2.8 center Breakthough Photography calls this anThe SMC Pentax L. S. 645 75mm f2. 8 is a unique lens, with a built in leaf shutter allowing for flash operation up to 1 500s: a significant improvement over the 645 body's 1 60s sync speed. This lens is in excellent cosmetic condition, with only light finish wear. Speeds are good. There is a very light circular polishing mark on the internal elements, visible under inspection light, which will not affect imaging.