Tamron SP 300mm (IF)

Tamron SP 300mm F/2.8 LD-IF Model 60B: This lens has a revised optical design compared to Tamron's earlier Model 107B, features internal focusing (IF), and features two low dispersion (LD) elements which are shown in green in the above optical layout. The addition of internal focusing required the addition of three additional internal lens elements for IF plus a redesign of both the front and rear optical groups. This lens is slightly sharper and has significantly higher contrast compared to the earlier Model 107B. Like the earlier 107B, this lens has very slight amounts of off-axis lateral color and coma, but these off-axis aberrations have been greatly reduced. Overall, this is a very sharp lens with performance which was not easily surpassed by similar OEM lenses of the era. Optical performance compared to current 300mm F/2.8 lenses is good to very good. Lens Specifications: Lens Model 60B Focal Length 300mm Aperture Range f/2.8 — 32, AE Angle of View 8° Optical Construction (Groups / Elements) 7 / 10 Min. Focus from Film Plane 98.4" (2.5m) Macro Mag. Ratio — Filter Size 43mm (rear), 112mm (front) Diameter 4.6" (117.5mm) Length at [w/Nikon mount] 8.3" (210.5mm) [8.5" (215mm)] Weight 73.9 oz. (2096g) Lens Hood Bayonet type #39FH, reversible. Accessory Accepts SP 2X tele-converter #01F. Supplied wth lens hood and SP 1.4X tele-converter #140F. Additional 43mm rear filters and 112mm front filter available as optional extras.