In a message dated 98-05-05 02:14:10 EDT,
Warren you write:
<< Does anyone know whether or not the Olympus F=40cm close up lens (49mm and
55mm) are two element achromatic types? Thanks. Warren Kato >>
Hi Warren,
I can not say how the lens is made. But I just ran a test a few weeks ago to
compare several of my close-up lens combinations at 0.5X mag. One thing came
out very clear (well not so). The OM close-up lens on my 85-250 at 150mm to
give 0.5mag was the worst of the lot. Only the center 1/2 was sharp enough to
consider usable. At 250 mm for approx. 1X mag -- you loose all but the center
1/3. At lower than 0.5x mag, I think the quality improves, although I have
not run any test to confirm this. But still, I was disappointed.
BW
< 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 >
|