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Glossary > Telescopes > Optics > Lens design

Glossary | Telescopes | Optics | Lens design

Doublet

A refractor with two lenses. Compared to an achromat, it displays significantly less chromatic aberration and more contrast.

Triplet

A lens telescope that almost completely corrects chromatic aberration. It consists of three lenses and offers very high optical performance thanks to its design.