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Tamron SP 300mm F/5.6 Model 54B: A very good fixed focal
length lens with excellent macro capabilities. Lens continuously focuses from
infinity to 1:3.3 macro and features a built-in lens hood. Most importantly,
this lens features a special "spherical aberration compensator group" (the
light blue shaded elements in the above drawing) to remove the focus group's
spherical aberration and field curvature when close focusing. A similar optical
group is also found in several other SP telephoto lenses which Tamron produced
during the 1980s. This lens is worth the price if you need a lens for macro
work yet need considerable working distance from the subject for personal
safety or other reasons. This lens should have sold better in its day, but few
photographers understood or appreciated the benefit of the spherical aberration
compensator group used within this lens for close focus work.
Lens Specifications:
| Lens Model |
54B |
| Focal Length |
300mm |
| Aperture Range |
f/5.6 — 32, AE |
| Angle of View |
8° |
Optical
Construction
(Groups / Elements) |
5 / 6 |
| Min. Focus from Film
Plane |
55.1" (1.4m) |
| Macro Mag. Ratio [w/2X
Converter] |
1:3.3 [1:1.6] |
| Filter Size |
58mm |
| Diameter |
2.5" (64.5mm) |
Length at
[w/Nikon mount] |
6.4" (163.5mm)
[6.6" (168mm)] |
| Weight |
21.5 oz. (610g) |
| Lens Hood |
Built-in type, retractable. |
| Accessory |
Accepts SP 2X tele-converter #01F. Tripod
mounting ring available as optional extra. |
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