LEICA APO-Summicron-M 90mm f/2 ASPH
LEICA 90mm f/2 APO-SUMMICRON-M ASPH (11 884, 55mm filters, 16.7 oz./473g, about $3,700). enlarge . I got this one at Adorama . I'd also suggest getting it at Amazon , B&H or Calumet . If you can't wait for a new one, used ones are readily available for $3,500-$4,500 (see How to Win at eBay ).
Fantastic anyplace you need a medium tele lens; and don't mind the extra size (55mm filters) and weight (475g total) compared to slower 90mm lenses
Anyone demanding the smallest, lightest lens; For this, use the 90mm f/2.8 TELE-ELMARIT-M (1974-1990, 39mm filters, 225g and about $400 used) or today's newest LEICA MACRO-ELMAR-M 90mm f/4 (39mm filters, 223g and about $2,000 new)