Capable of being made achromatic or of having chromatic aberration corrected; describing a lens or optical system that can be improved.
From 'achromatize' + '-able' (suffix forming adjectives meaning 'capable of'). Formed in optical science to describe potential improvements to lens systems.
Not every lens problem is achromatizable—some optical flaws are baked into the design and can't be fixed, which is why scientists had to invent entirely new telescope designs!
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