> I guess that Tamron took a different approach from Vivitar and > Tokina for their "matched accessories", Jeff. Vivitar and Tokina, > instead of going the "2X matched multiplier" route, went with a 1:1 > matched adapter/extender" instead. The advantage/disadvantage is > that the VS1 and AT-X 90/2.5 macro lenses are still 90mm lenses (and > not 180mm lenses) when used with their "macro adapter" (Vivitar) or > "macro extender" (Tokina). The good news is that they are still > f/2.5 lenses even with their attachments.
The nice thing about the matched multiplier is that I can also use it with my SP 70-210/3.5-4, making it into a 140-420 zoom. Jeff - 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 .
