Archived posting to the Leica Users Group, 2000/04/23

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Subject: Vs: [Leica] APO or not APO
From: "Raimo Korhonen" <raimo.korhonen@pp2.inet.fi>
Date: Sun, 23 Apr 2000 10:05:42 +0200

No glass in itself is apochromatic. Lens gets its apochromatic properties by combining glasses of different types with different light-bending properties i.e. refraction or dispersion in order to focus the three primary colours in the same plane. And Leica do not make their own glass. 
All the best!
Raimo
photos at http://personal.inet.fi/private/raimo.korhonen

- -----Alkuperäinen viesti-----
Lähettäjä: Martin Howard <howard.390@osu.edu>
Vastaanottaja: Leica Users Group <leica-users@mejac.palo-alto.ca.us>
Päivä: 22. huhtikuuta 2000 23:12
Aihe: [Leica] APO or not APO


>
>Some time ago, someone hinted in a message that Leica's APO glass was made
>to a higher standard than other manufacturer's APO glass.  Could someone
>please shed some light on the various APO, LD, L, &c., lenses that exist?
>How can you determine the relative quality of different manufacturer's
>offerings?  Or is it just lore?
>
>M.
>
>-- 
>Martin Howard                     |
>Visiting Scholar, CSEL, OSU       |  All wiyht. Rho sritched mg
>email: howard.390@osu.edu         |  kegtops awound?
>www: http://mvhoward.i.am/        +---------------------------------------
>
>
>