On 26 Jan 2001, at 21:26, Shel Belinkoff wrote:
> Dan Scott wrote:
>
> > Don't lenses age over time, too?
> > Maybe what you are seeing is the
> > difference caused by the coatings
> > on the older lenses oxidising over time?
>
> I've not heard of coatings oxidizing. However, I've purchased
> new M-series lenses within the last year or so, as well as
> having recently purchased new and used A-series lenses, and a
> new FA lens, and each series show differences in the the
> coatings.
Another list member and myself compared coating colours (verbally) between
4 pieces of the same model A series lens, he had an early serial no and a
more recent and I had a similar combination. My two lenses definitely
showed different coloured reflections in their front elements, the colour
descriptions that I provided for comparison were it seems similar to the set
owned by the other owner. So yes there were visual differences in the
coatings however whether this was due to re-formulation of or aging of the
coatings is anyones guess however my two samples showed no noticeable
signs of a difference of performance WRT flare or transmission colour.
Cheers,
Rob Studdert
HURSTVILLE AUSTRALIA
Tel +61-2-9554-4110
Fax +61-2-9554-9259
UTC(GMT) +10 Hours
[EMAIL PROTECTED]
http://www.ozemail.com.au/~distudio/publications.html
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