SUPERB IMAGE QUALITY - Experience exceptional sharpness and clarity with the 90mm focal length, perfect for detailed portraits and landscapes on your Pentax 645. FAST APERTURE PERFORMANCE - The wide f/2.8 aperture excels in low light, offering beautiful bokeh and precise depth of field control for stunning visual effects. ROBUST BUILD QUALITY - Crafted with 11 elements in 9 groups, this lens ensures durability and optical precision, making it a reliable tool for professional use. OPTIMIZED FOCAL LENGTH - Achieve versatile shots with the 90mm lens (71mm equivalent in 35mm format), ideal for portraits, landscapes, and detailed close-ups.