Pentax K1000 brand_Cartoni The Kenko Fish-Eye 180º is

The Kenko Fish-Eye 180º is an accessory fisheye lens for lenses with 52mm threads

with smooth mechanical action and an accurate shutter

and a passthrough column for running cable

but these won't be detrimental to image quality–and you want to use this lens wide open anyways

Feels real crappy in the hand but maybe that's cool now

Pentax K1000 brand_Cartoni The Kenko Fish-Eye 180º isThe Pentax K1000 is a classic mechanical 35mm SLR camera with shutter speeds from 1s to 1 1000s, an easy to read light meter, and that's it. A nice camera, and fun to use. Compatible with Pentax K mount lenses (sold separately). In good condition overall, with some cosmetic surface wear, one small spot on the focusing screen which does not affect function. New light seals, good shutter speeds and metering.