The lens has built-in CPU and is Ai-S compatible, the optical design is not changed.

Focal length 58mm
Aperture ratio 1: 1.4
Minimum aperture F16
Lens constitution 6 groups seven
Angle of view 40 °
Aperture number of blades Nine
Shortest shooting distance 0.45m
Maximum magnification 1: 5.8
The maximum diameter × total length φ67.6 × 45.5mm
Filter Size φ52mm
weight 320g
mount Ai-S (CPU internal organs)
Lens hood Round screw-type hood LH-58s (sold separately)

Sample: http://www.cosina.co.jp/gallery/kano-58F1_4s/index.html