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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. |
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