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Introduced in September, 1981, the AI-S spec version was seen as a direct upgrade from the revised optical formula of 5 elements in 5 groups design first used the AI version introduced earlier back in April, 1978. Generally, the lens has enjoyed a good reputation as a top grade wideangle lens. However, a physical handicap presented by this lens is, most people may feel its slow maximum aperture lens often restrict it to be an ultimate 35mm wideangle. It may need faster film type to work efficiently
Optics : 5 elements in 5 groups.
Focal : Length 35mm .
Close : Focu1 foot (0.3 meters).
Weight : 8.302 oz. (235.4g), actual measured weight.