----- Original Message -----
From: "K.Takeshita" <[EMAIL PROTECTED]>
> on 1/26/01 9:47 AM, K.Takeshita at [EMAIL PROTECTED] wrote:
>
> > In addition to 2 Aspherical glasses, an extra low dispersion glass
>
> Perhaps I shouldn't have used the terminology "glass" here. Instead, it
> should have been "lens", as in a stricter sense, we do not know if they are
> "glasses". I am almost certain that at least ALs are of hybrid type, as the
> aspherical surface is created in resin and "glued" to glass using special
> clear resin in the case of Pentax.
>
> Just for clarification. Correct me if I am wrong.
>
> Cheers,
>
> Ken
>
Does anyone know how chemically stable those resins used in these lenses are?
How many years of service can we expect before they start degrading?
Michel
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