SMC Pentax 28mm f3.5 viewing filter Standard 1/4" thread up to

Standard 1/4" thread up to for camera attachment

they form a potentially useful accessory which I have been told bears a cursory resemblance to a gorilla

and Memory Stick

Interior dimensions are approximately 16x16x28cm

but overall this seems like the simplest explanation

SMC Pentax 28mm f3.5 viewing filter Standard 1/4" thread up toThe SMC Pentax 28mm f3. 5 is a wide angle lens for K mount from Pentax's original K mount line, before they started doing in the "Pentax M" thing. Larger and heavier than later models, this is still a reasonably compact lens. Cosmetic condition is very good, with light paint wear. Smooth focusing, good diaphragm, light internal dust.