The Tamron SP 500 mm f/ 8 Adaptall-2 model 55B Lens. Specs. MTF Charts. User Reviews.
Tamron 500mm f/8 SP macro (Adaptall-to-Nikon) Review / Test Report
TAMRON SP 500mm F8 Mirror (55BB) | eBay
Amazon.com : Tamron AF 200-500mm f/5.0-6.3 Di LD SP FEC (IF) Lens for Canon Digital SLR Cameras (Model A08E) (Discontinued by Manufacturer) : Camera Lenses : Electronics
Tamron SP 500mm f/8 Tele Macro (55BB) Lens (Requires Adaptall Mount) {30.5} at KEH Camera