The Ai 35/2.8 is an all new lens with a simplified 5-element design, similar to the series-E 35/2.5. Main distinguishing features are the depth-of-field scale on black level with the focus ring, and a much more compressed focus scale.
350001 < 350351 – 356920 >
< 358365 – 459942 >
From approx 39xxxx aperture coupling prong made of pressed sheet metal.