>However, I *do* own the
>Tamron 90/2.5 macro with 49mm filter threads and I do not believe
>it is a floating element lens design. when focusing closer with the
helicoid,
>the entier lens moves as a unit closer to hte subject. There is no
internal
>movement that would be required for a floating element lens.
Quoting from the owners manual for this lens (page 4)
"The most distinctive characteristic of the lens' optical configuration is
that it features a floating system to compensate for aberrations"
It goes on to say that the rear element is stationary and as the front
elements move, the stationary element does something with big words.
Foxy
< This message was delivered via the Olympus Mailing List >
< For questions, mailto:owner-olympus@xxxxxxxxxxxxxxx >
< Web Page: http://Zuiko.sls.bc.ca/swright/olympuslist.html >
|