Aren�t they both made by Kino Precision (Kiron, that is)? All the best! Raimo Personal photography homepage at http://www.uusikaupunki.fi/~raikorho
-----Alkuper�inen viesti----- L�hett�j�: Fred <[EMAIL PROTECTED]> Vastaanottaja: [EMAIL PROTECTED] <[EMAIL PROTECTED]> P�iv�: 28. tammikuuta 2003 15:55 Aihe: Re: tokina and vivitar series 1 90mm macros are they really the same >> an interesting test found >> http://members.aol.com/olympusom/lenstests/default.htm >> Tokina AT-X 90mm f/2.5 Macro [snip] >> Vivitar Series 1 90mm f/2.5 Macro [snip] > >Thanks for the info, adphoto. There are differences in the two >tests, but I think that the differences (even though they mostly >"favor" the VS1 version) are fairly small, and probably could fall >within the range of sample-to-sample variance. > >I still maintain that the VS1 90/2.5 Macro and its 1:1 Macro Adapter >are the same design as the Tokina AT-X 90/2.5 and its 1:1 Macro >Extender, despite some physical, mechanical, and and cosmetic >differences. In fact, Paul has suggested that they were both made by >Tokina. Certainly, the details of their optics (as published and as >I measured) appear to be identical. > >I have used both versions myself, and I can't see any significant >difference between them. See: > >VS1 @ 4:1 @ f/8 (without 1:1 Macro Adapter) - > http://www.cetussoft.com/pentax/v9025/v9025-41-8.jpg >VS1 @ 2:1 @ f/8 (without 1:1 Macro Adapter) - > http://www.cetussoft.com/pentax/v9025/v9025-21-8.jpg >VS1 @ 1:1 @ f/8 (with 1:1 Macro Adapter) - > http://www.cetussoft.com/pentax/v9025/v9025-11-8.jpg >AT-X @ 4:1 @ f/8 (without 1:1 Macro Extender) - > http://www.cetussoft.com/pentax/x9025/x9025-41-8.jpg >AT-X @ 2:1 @ f/8 (without 1:1 Macro Extender) - > http://www.cetussoft.com/pentax/x9025/x9025-21-8.jpg >AT-X @ 1:1 @ f/8 (with 1:1 Macro Extender) - > http://www.cetussoft.com/pentax/x9025/x9025-11-8.jpg > >Despite the similarities, however, it is not surprising that there >would be at least some small differences - after all, even if they >were both made by Tokina, the VS1 version was produced basically in >the late 1970's, while the AT-X version was a product of the 1980's. > >Fred >
