Yes and No. It is a fine lens for its intended use - but maybe not for what you want. The lens was really intended as an excellent long macro, with decent performance as a 300mm telephoto.
Here's the description of the lens from the Adaptall-2 website.
"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."
Here's the Link
Tamron SP Adaptall-2 #54B 300mm f/5.6 Flat Field Tele-Macro
It really isn't the lens you are looking for. Not the one for you. Nope, you want something better.
If you want to swap it for some cash, send me a PM