Hello Francis:
<< i was interested in getting the auto macro tube 65-116 but have been unsure
as to which head lens to get. >>
There are 4: the 20, 38, 80, and 135 mm. Which one depends on the
magnification ratio you are intending to photograph at. You didn't state any.
<< i was wondering how the 50 3.5 or 2.0macro lenses work with this or even
the 90 2.0. >>
They aren't intended for it's use. It's too long at it's shortest reach. For
example, a 25 mm extension tube takes the 50 mm from 1:2 to 1:1
<< what types of magnifications do i get and what is the resolution compared
with the the more dedicated hear lenses. do you know a good source of
information for this? >>
The range of magnifications for the three lenses are as follows:
20 mm = 6.8:1 to 9.5:1
38 mm = 3.1:1 to 4.5:1
80 mm = 1:2 to 1.2:1 [to 2:1 with Close-Up Lens 80 mm]
135 mm = infinity to 1:2.3
Obviously there are gaps here, which would be narrowed with the bellows rather
than the Telescoping Extension Tube. (I seem to recall small gaps even with
the bellows.) My info is from the out of print "The OM System Lens Handbook"
although there are other sources.
As far as lens tests, I don't ever recall any. But knowing the compromises
needed in producing macro lenses - which most manufactures have ignored - it
holds that these four lenses are optically more efficient than what might seem
like more versatile designs from other manufacturers. In another words, I'm
confident that they can't make them much better than these! (The 80 mm seems
flawless to me. The 135 mm isn't acceptable to me at infinity, but it was
designed for optimum performance at 1:5 and does great in macro.) Plus, one
is hard pressed to find 35 mm optics that go greater in life size than 1:1
The 38 and 20 mm *auto* lenses were Olympus exclusives.
Gary Reese
Las Vegas, NV
############################################################
| 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
############################################################
|