On Tuesday, August 12, 2003, at 12:31 AM, Donald Shedrick wrote:
I checked my 55 f1.2 more carefully, and with a little imagination
thrown in I think I see a slight falloff of the yellowing at the
edges. It is not a gradual, but a more of a sudden change near the
edge. BTW, a skylight filter reduces the visibility of the
yellowing.
--- whunter <whunterjr@xxxxxxxx> wrote:
From the posted picture I do not perceive a fall off in intensity
from the center to the periphery to the extent expected, but
expectations are empirical given the absence of thickness
measurements.
You, Dapoz and others own the lenses. Mark's posted pix is my only
reference. Suffice to say that those with the lens seem to concur re
the color intensity being proportional to the thickness of a convex
lens at any point in the gradient. Next big question in relation to
potential resuscitation is whether the color change is a direct
consequence of chemical change characteristic of rare earths or
confined solely to radiation induced alterations? The former might be
amenable to partial resolution. My bet gives even odds and defers to
the real answer......
Now for my question: my impression over the years is that of marginal
professional respect for the Z. 75-150. Was pleasantly surprised to
read your comment, albeit brief. This lens covers the heart of a
'working range' for many. Is that your assessment? Better lens for
this general range?
Thanks
Bill
< 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 >
|