The Pentax interchangeable lens system provides a complete line of high-quality lenses to satisfy your every creative need. Offering a wide range of focal lengths, functions and effects for different formats, Pentax lenses are designed to maximize each camera s capabilities. This lens is designed for 645 cameras. Item Specifications: Product Description: Pentax SMC P FA 645 - lens - 75 mm Lens System: Lens Lens Aperture: F/2.8 Focal Length: 75 mm Min Focus Range: 23.6 in Focus Adjustment: Automatic, manual Lens Construction: 5 group(s) / 6 element(s) Filter Size: 58 mm Length: 1 in Weight: 7.6 oz