Asahi Pentax K extension tube set wet plate optics have light dust and

optics have light dust and some edge-paint bubbling

or use it as a low-profile ball head on its own

The Nikon TC-14EII is an autofocus teleconverter designed for select Nikon AF-S telephoto lenses (here's Nikon's compatibility list)

okay cosmetics

Asahi Pentax K extension tube set wet plate optics have light dust andThis Asahi Pentax K extension tube set includes three tubes (9. 5mm, 19mm, and 28. 5mm) designed to increase magnification for close up work. These are manual tubes there's no aperture automation or electronic communication so you'll need a lens that has its own aperture ring. Lens is sold separately (this is just tubes)