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MgF2 Coated Negative Achromatic Lenses

MgF<sub>2</sub> Coated Negative Achromatic Lenses

Consisting of two optical elements cemented together, negative doublet lenses are corrected for color and on-axis aberrations. Used predominantly as Barlow lenses to extend focal lengths, they are often combined with positive achromatic mirror systems and imaging lenses.

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