B&H currently has a listing for a used Leica 50mm f/1.2 Noctilux M Asph lens priced at $20k ($19,999.90 to be exact). This actually is a good price for this very rare lens. Read more about it here and here. Update: there are actually several Leica 50mm f/1.2 Noctilux lenses listed for sale on eBay.
Specifications (via KEH):
- Focal Length: 50 mm
- Aperture Maximum: f/1.2
- Aperture Minimum: f/16
- Camera Mount Type: Leica M
- Format Compatibility: 35mm film or digital
- Minimum Focus Distance: 3.28 feet
- Elements/Groups: 6/4
- Encoded: N/A
- Angle of View: 45 degrees
- Tripod Collar: No
- Filter Thread: Series 8
- Dimensions: (Diameter x Length:) 61 mm x 60 mm
- Weight: 515 g
