Compact ultra-wide manual focus prime for Pentax K-mount, sharp optics in a tiny package for landscapes and architecture.
A vintage ultra-wide prime from Pentax at 20mm f/4.5. Without a specific designation in the canonical name, this is likely the Super-Takumar 20mm f/4.5 (M42 mount) or an equivalent Pentax ultra-wide of the era. Confirm specific model and mount before purchase.
f/4.5 maximum aperture. 20mm focal length (full-frame). Manual focus. Mount: not confirmed — likely M42 (Super-Takumar era) or Pentax K; verify from physical lens.
Pentax produced 20mm ultra-wide lenses across multiple mount generations: M42 screw (Super-Takumar, SMC Takumar) and K bayonet (SMC Pentax, SMC Pentax-A). The f/4.5 aperture is characteristic of the M42 Super-Takumar era. Verify specific variant and mount.
On the used market, a vintage Pentax ultra-wide prime. Condition checks: front element for haze or marks, aperture blade condition, focus ring. CONFIRM MOUNT and specific model before purchase.