Achromatic lens
= Achromatic lens
{wiki}
An achromatic lens combines elements with different <Abbe numbers> to make two specified <wavelengths> share a <focal length>. Other wavelengths can retain secondary chromatic error.
= Achromatic lens
{wiki}
An achromatic lens combines elements with different <Abbe numbers> to make two specified <wavelengths> share a <focal length>. Other wavelengths can retain secondary chromatic error.