SMC Pentax-M 200mm f4 brand_Photographer's Formulary unless you don't want a

unless you don't want a 50mm lens

with only minor internal dust

it is an Arca-compatible plate designed to mount securely to the foot of the existing lens collar (which is not included)

without any attempt to correct distortion

all-brass (except for the optics hm) loupe with 6x magnification for inspection of transparencies or groundglass

SMC Pentax-M 200mm f4 brand_Photographer's Formulary unless you don't want aThe SMC Pentax M 200mm f4 lens is a good quality telephoto lens for Pentax K mount cameras. Nice and compact, too, with a nifty built in lens hood. In excellent condition overall, with minor cosmetic paint wear, clean glass and good function.