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© Schott Glass

Aero Ektar possible Rear earth glass types from patent 2343627 AKLIN /Kodak

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Schott Abbe diagram; showing patent 2343627 AKLIN /Kodak 7 elements in 4 groups 100mm F2.5 element in groups sequence = 1/2/2/2 element #V Nd= 1.745 V=46.4 element #VI Nd= 1.755 V=47.2

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