SMC Pentax-M 28mm f2.8 brand_Paterson but note that this head

but note that this head is made of "Technopolymer"- that is to say

Compatible with standard Technika lens boards (sold separately

Metal lens hood and filter adapter for Fujifilm X100 series cameras

This Fotodiox accessory is designed to replace the two-piece plastic e-mount found on several earlier Sony NEX and Alpha cameras

SMC Pentax-M 28mm f2.8 brand_Paterson but note that this headThe SMC Pentax M 28mm f2. 8 is a compact wide angle lens that's about the same size as the standard 50mm lens but with a substantially wider field of view. Great for groups and architecture, with a still pretty fast f2. 8 aperture. In excellent condition, with minor cosmetic wear, clean glass with light dust.