Model 54B
SP Symbol300mmF/5.6
Flat-Field Tele-Macro
Tamron SP Adaptall-2 300mm F/5.6 Model 54B Lens

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
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.
Copyright ©2005-MEM-TEK. All rights reserved. Site contents, services and terms of use are subject to change without notice. Adaptall-2.com is not is not affiliated with Tamron Co., Ltd. or with any of its subsidiary companies. Tamron Co., Ltd. and its subsidiaries neither endorse, control, nor claim any responsibility for the content and accuracy of this Web site.