-----Original Message-----
From: Gary Schloss <schloss@xxxxxxxxxxxxx>
>Garth Wood wrote:
>
>>A Vivitar 90mm f/2.5 Series 1 macro focusing lens has shown up at auction
>>on eBay for the Oly OM series of cameras. Anyone have any opinions on
this
>>lens?
>
>This excellent lens was made by Tokina, which later released its own
>version -- the Tokina AT-X 90mm F2.5. Both are great pieces of glass
>in every respect. There is a separate 1:1 macro adapter for each.
>
The Vivitar adapter is optical. Is the Tokina identical and interchangeable?
If so, they may still be available for a while to purchase for the Vivitar
lens. I would be first in line as my 90mm S1 for OM lacks the adapter. I
have an absolutely mint one with adapter for screw mount.
>IMHO, the Tokina with its 55mm filter size (vs 58mm for Vivitar) is
>a little friendlier to an OM user. Moreover, its min. aperture is 32
>(vs only 22 on the Vivitar). OTOH, Vivitar's 1:1 adapter has a very
>solid and very handy tripod collar (Tokina's 1:1 has none).
>
The f/32 may be of little practical importance. As a rule, this is too small
for best sharpness with a 90mm lens. The point is reached where loss of
sharpness from the small aperture is worse than loss from DOF.
Doug
############################################################
| This message was delivered via the Olympus Mailing List
| To receive the Digest version mailto:listserv@xxxxxxxxxxxxxxx
| with "subscribe olympus-digest" in the message body.
| To unsubscribe from the current list mailto:listserv@xxxxxxxxxxxxxxx
| with "unsubscribe olympus" in the body.
| For questions mailto:owner-olympus@xxxxxxxxxxxxxxx
| Web Page: http://Zuiko.sls.bc.ca/swright/olympuslist.html
############################################################
|