On Mon, 11 Aug 2003, whunter wrote:
> Now Sports Fans........ Take another look at the image by Dapoz.
> (Mark - Can you shoot this again minus the distracting reflection in
> the center right where the answer may lie??)
> - I see, aside from the reflection, a disk of yellow with greatest
> intensity in the center and extremely uniform falloff to the periphery.
> If true, this would be consistent with uniform yallering of the glass
> of a convex element. (????) with insignificant contribution from the
> surface of the lens. i.e. If the surface contained the yaller, the
> entire yaller area would be uniform yaller intensity. No??
Ok, I've re-shot it using outdoor ambient light instead of the cheesy built
in flash. If we need better results then I'll have to switch to using the
OM's rather than this digital P&S. There is indeed a higher insensity of
yellowing in the centre than the edges. Here are the results:
http://olympus.dementia.org/misc/55mm_yellowing_front.jpg
http://olympus.dementia.org/misc/55mm_yellowing_back.jpg
It's more obvious when looking through the rear, but you can see it both
photographs. I'd say the yellowing is being caused by the glass and not
the coatings.
-mark
< 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 >
|
