Ruscello,
The lens you describe is the first version of the AF 24/2.8. The first AF
lenses have the features you describe:
- narrow plastic focusing ring
- rotating minimum aperture lock
The first AF 24/2.8 was in production from 10/86 - 06/91, when it was
replaced with the newer model with the wider rubber focusing ring and a
sliding aperture lock.
All versions of the 24/2.8 have CRC, and this lens has the same optics as
the manual focus AI and AIS lenses, and the current AF-D version.
The slight scratch on the front element is not serious, especially since
it is near the edge of the lens. It won't affect your pictures.
Roland
