SMC Pentax Fish-Eye 17mm f4 brand_Arca Swiss It accommodates an extra EN-EL15

It accommodates an extra EN-EL15 battery (sold separately) with the included MD-D12EN insert

Leitz New York SL skylight filter for the 50mm f1

But it still takes a pretty nice picture

dust and minor haze on the optics

This one is a rarer black paint model in excellent cosmetic condition

SMC Pentax Fish-Eye 17mm f4 brand_Arca Swiss It accommodates an extra EN-EL15The Pentax Fish Eye 17mm f4 is a tiny fisheye lens with full 180 degree corner to corner coverage on 35mm film (or full frame digital). It extends only about 3. 5cm from the lensmount and has a built in rotating turret of filters with orange, yellow, UV, and skylight options. Clean glass, smooth focusing, clean diaphragm, and only very minor cosmetic wear.