> I'm looking for a 24 or 28 for my newly bought Nikon FM. I've heard that
> some of the MF AIS lenses had floating glass elements, which gives additional
> sharpness. If anyone has any firsthand experience with these, I'd love to
> hear your impressions. Am I correct in that the 24 f2.8 AIS and 28 f2.0 AIS
> are the only two in these focal lengths with this feature ?

Steve,
lenses with floating element (close range correction or CRC as nikon calls 
it) include:
15/3.5
18mm (AIS and AF only)
20/2.8 (all versions)
24/2.8 (all versions)
24/2 (all versions)
28/2 (all versions)
28/2.8 (AIS and AF-D only)
35/1.4 (all versions)
55/2.8 micro
60/2.8 micro
85/1.4 (all versions)
105/2.8 micro (all versions)
200/4 micro AF

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