This lens was branded under several different names: Cosina, Promaster, Vivitar, Soligor, Tokina, etc. Look at http://www.dyxum.com/reviews/lenses/Cosina-60-300mm-F4---5.6_review458.html My lens is a Soligor copy (built in 1988) with Minolta A-mount, called: "AF 60-300mm F4-5.6 licensed by Minolta". This lens has a rod drive for Autofocus, which is very loud. Its body is all metal - built like a tank! The optical quality is good - nice colors.

also look at http://allphotolenses.com/lenses/item/c_865.html or http://allphotolenses.com/lenses/item/c_1561.html

Yes, this lens was branded under several different names, but there are many variations too from AF/MF to various degrees of coatings, weight, size, etc. Would be interesting to have a comparison of all these ...

The Soligor MF MC C/D-version has been tested by the renowned German fotoMagazin 07/1988 (Note: super; Optik 9.2, Mechanik 9.0) against competitors from Nikon, Canon and Minolta and -surprise!- it won. Furthermore there are results from a testing by a German optics institute available, see http://www.aphog.de/forum/viewtopic.php?f=1&t=5775. All of these confirm the by brand name unusual high quality of this lens.