apochromat

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apochromat

(ˌæpəˈkrəʊmæt) or

apochromatic lens

n
(General Physics) a lens, consisting of three or more elements of different types of glass, that is designed to bring light of three colours to the same focal point, thus reducing its chromatic aberration. Compare achromat
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So it's no surprise that I was looking forward to reviewing Stellarvue's new SVR102T Raptor Apochromatic Triplet late last spring.
The latter, with an aperture of 150mm, will perform as well as many modern expensive short focus apochromatic triplet telescopes.