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he 5.8mm f/3.5 Circular Fisheye Lens for Pentax K from Lensbaby is a manual focus lens with a wide 5.8mm focal length that provides a fully circular image optimized for APS-C-format cameras. It is compatible with full frame image sensors by producing a smaller image within the frame. The lens has an aperture range of f/3.5 to f/22 and captures a 185˚ angle of view. It features a close focusing range starting at 0.25" and going to infinity, all while providing expansive depth of field and image sharpness. This Lensbaby lens doesn't bend, so the fisheye image is always perfectly centered in the frame.
Focus distance scale and DOF scale on the lens aids in focusing
Polished internal barrel for reflection and creative flare, which fills the border around image circle with colors from bright light sources in the photo