In article ,
Bert Coules wrote:
Not an approach I'd considered, I must admit. The appeal of the ones in
the link of course is that they seem to be continuously variable: I can
see that being useful.

A multi element lens is not going to be ideal for specs.

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*Why do the two "sanction"s (noun and verb) mean opposites?*

Dave Plowman London SW
To e-mail, change noise into sound.