The first version, the Konica Hexanon 28mm F3.5, was a preset lens. The 2nd version, the Konica Hexanon AR 28mm F3.5, from then on, had auto aperture and was labeled EE. The third version was labeled AE, had auto aperture up to F16, and was still large and all metal with updated coatings. The fourth version, this one, is labeled AE, has auto aperture up to F22, and is smaller and lighter at 175 grams. The fifth version was plasticky (typical 80s) and could have performed better compared to its counterparts. The lens was marketed as a Hexar.
The optical design of the variations has also been altered several times, from the original 7 elements in 6 groups on the preset lens, to 7 elements in 7 groups, and finally to 5 elements in 5 groups for the final version. The filter thread for the preset was 58 mm, with the rest at 55 mm.






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