Archived posting to the Leica Users Group, 1999/01/24

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Subject: Re: [Leica] Glass? Who said anything about GLASS ASPH?
From: Mark Rabiner <mrabiner@concentric.net>
Date: Sun, 24 Jan 1999 18:08:01 -0800
 
Lucian Chis wrote:
> 
> If I am not mistaking, the cost of older ASPH lenses was dictated by GLASS
> aspherical elements whereas newer ASPH have PLASTIC molded aspherical
> elements. Even for Leica. I don't know the particulars, but I would think
> you can't get the same refringency index from plastic as from heavy glass
> (glass with rare earth components).
> What do you guys know of this?
> 
> Lucian
> 
snip'
I hope you've got an asbestos spacesuit with a thick fireproof glass
visor because if you are insinuating the existence of plastic elements
in Leica M or otherwise glass you can say goody to your eyebrows.
Mark Rabiner :-)