Typically, A purple coating is indicative of single coating
using magnesium flouride, which I think is the standard
single-coating material.
But when you look at reflections in MC lenses and see green, a little magenta
and other colors at different "levels" in the lens I think you are seeing the
reflections from all internal lens elements. It may be that not ALL the lens
surfaces are multi-coated and that SOME are single coated Mag flouride and that
these lens elements will give you the purple reflections. So I'm guessing the
multi-coated designation just means that AT LEAST ONE element is multicoated,
but not necessarilly all of them.
Mark Hammons
Alan
I am not entirely sure, but a purple reflection should mean multi-coating
as well. I have numerous olympus digital SLRs that I *know* are
multi-coated and have the purple color to them when examined under light.
This, however, may be different with Zuikos.
Someone correct me if I'm wrong, because I don't want to go buy a purple
lens thinking it's mc'd when it's not :)
Chris
At 05:40 AM 5/16/2001, you wrote:
>Hum -- I have one 50mmf1.8 from around 1978/79 that has neither gold nor green
>reflection. Instead it is just purple. Purple Purple Purple. I thought all
>lenses by 1978 were MC? My 35f2 from 1981/2ish is marked MC.
>
>Alan
>
>< 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 >
< 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 >
< 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 >
|