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"The PENTAX smc P-A 400mm F2.8 ED(IF) telephoto lens is a manual focus lens with automatic aperture. It is ideal for advanced sports, action, and wildlife photographers and features a maximum aperture of 2.8 for shooting in low-light conditions. It also features an internal focus system to make focusing smoother and faster, and incorporates a high-refraction extra low dispersion (ED) glass element to produce high-resolution, high-contrast images."
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