Nikon Reflex-Nikkor 500mm f8 brand_Schneider-Kreuznach This is definitely an old-school

This is definitely an old-school DIY camera

Because it's a German camera from the 1950s and no mechanism is too weird or too complicated to make it to production

Mounts that may work (see manual): WESS and Hama DSR

The SMC Pentax-M 28mm f2

the front cut will prevent the self timer from being used

Nikon Reflex-Nikkor 500mm f8 brand_Schneider-Kreuznach This is definitely an old-schoolNikon Reflex Nikkor 500mm f8 is a reflex telephoto lens for Nikon F mount. Right off the top, mirror lenses have a few "downsides": they don't have an adjustable aperture, and out of focus highlights can take on a donut like appearance. This lens includes a pair of rear mounted ND filters to help moderate exposures, so that's at least some help for the first issue; as for the donuts, well, you may just have to learn to like the donuts. The upside is