This 24mm lens has a fast f/1.8 maximum aperture with macro focusing capability (minimum focusing distance is 7.1" for a reproduction ratio of 1:2.7). The 9-bladed aperture diaphragm obtains beautiful, circular out of focus characteristics. It incorporates a floating focus system and uses two aspherical elements for minimized distortion, spherical aberration and astigmatism. The lens front does not rotate during focusing, thus allowing the use of a "perfect hood" and the easy polarizing filters. Optical construction was created to minimize light falloff (darkening of the image corners) at maximum aperture-a big benefit particularly for digital cameras. Materials used in this lens are lead and arsenic free ecological glass.
Filter Size 77mm f/Stop Range 1.8-22 Minimum Focus Distance 7.1" Magnification 1:2.7 Zoom/Focus Control Not applicable Angle of View 84.1 Degrees Groups/Elements 9/10 Tripod Collar No Length 3.1" Maximum Diameter 3.3" Weight 1.07 lb