> The Vivitar Series 1 90/2.5 macro (8 elements in 7 groups, > floating-element design) and matching 1:1 adapter (3 elements in 3 > groups) were made by Tokina, which later introduced its own 90/2.5 > macro and 1:1 adapter of the same optical formula. The Vivitar has > a tripod ring; the Tokina version omitted the ring but added the > PKA setting and may have added internal baffling to solve a flare > problem that was said to affect the Vivitar at nonmacro distances, > according to the Nikon and Olympus discussion sites.
Just one point, Paul: The Tokina version was available in both K-mount and Ka-mount editions. Fred - This message is from the Pentax-Discuss Mail List. To unsubscribe, go to http://www.pdml.net and follow the directions. Don't forget to visit the Pentax Users' Gallery at http://pug.komkon.org .
