What do you mean with the statement "it's the least accurate" - we are talking about
very small tolerances, about 1/1000 of millimetres here. The polymer layers are that
thin. Do you have any data to verify your conclusions? Glass ground to shape is indeed
the best method but I do not think that any lens elements are hand ground these days.
All the best!
Raimo
Personal photography homepage at http://personal.inet.fi/private/raimo.korhonen
-----Alkuperäinen viesti-----
Lähettäjä: Mike Johnston <[EMAIL PROTECTED]>
Vastaanottaja: [EMAIL PROTECTED] <[EMAIL PROTECTED]>
Päivä: 28. tammikuuta 2001 18:05
Aihe: Re: Plastic Crap Lenses or High-Tech Precision?
<snip>It's the least accurate but also the
>cheapest method of manufacturing an aspheric element, most often found in
>"consumer grade" zooms.
>
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