Sigma's vintage 24mm wide-angle — the Super-Wide II for Pentax K mount.
The Sigma 24mm f/2.8 Super-Wide II is a vintage wide-angle prime for Pentax K mount from Sigma's earlier production era. The Super-Wide designation indicates Sigma's wide-angle specialty line. At 24mm f/2.8, it provides a useful wide-angle perspective for landscape, architecture, and street photography on Pentax K-mount cameras.
Optical performance is decent for the era. Sharpness is acceptable when stopped down. The f/2.8 aperture provides a reasonably bright viewfinder. Multi-coating quality varies by production era. Distortion is moderate barrel-type typical of 24mm lenses from this period. A functional wide-angle option though outclassed by later designs.
Pentax K mount. Filter thread is typically 52mm. Weight is approximately 230 grams — compact. Build quality is solid metal construction. Manual focus only — predates Sigma's AF era for Pentax. Compatible with all Pentax K-mount bodies. Benefits from Pentax's in-body stabilisation on digital bodies.
Very cheap on the used market. Check for fungus, haze, and smooth focus. A basic vintage wide-angle for Pentax K-mount shooters. Better alternatives exist at modest prices. Only of interest for very budget-conscious wide-angle shooting on Pentax bodies.