The Sigma 12–24mm f/4.5–5.6 EX DG IF HSM Ultra Wide Angle Zoom Lens is designed for photographers who require maximum coverage with controlled optical performance on Pentax and Samsung SLR cameras. Offering an extreme 122-degree diagonal angle of view at 12mm, this lens enables full-scene capture in tight interiors, sweeping landscapes, and architectural environments where space and perspective are critical. Its optical construction incorporates four Special Low Dispersion elements and aspherical lenses to reduce color fringing, distortion, and edge softness, supporting consistent clarity across the 12–24mm zoom range. The internal focusing system maintains a fixed lens length during operation, improving handling stability and framing accuracy when shifting focus distances. A close focusing distance of approximately 11 inches allows for strong foreground emphasis while preserving wide background context. Sigma’s Super Multi Coating helps control flare and ghosting in challenging lighting, and the EX DG design ensures compatibility with digital SLR sensors. Compact dimensions and balanced weight make this lens well suited for photographers seeking reliable ultra wide performance for interior, architectural, and landscape photography.Bundle IncludesSIGMA 12-24MM FOR PENTAX AF DGCleaning KitLens Cap Keeper