achromatism การใช้

This artifice is specially adopted in objectives for astronomical photography ( " pure actinic achromatism " ).
The qualitatively divided retina ( color ) is thus reunited in full activity, resulting in achromatism ( the absence of color ).
Newton failed to perceive the existence of media of different dispersive powers required by achromatism; consequently he constructed large reflectors instead of refractors.
According to Schopenhauer, achromatism results when refraction occurs in one direction in the concave lens and in another direction in the convex lens.
Dollond was aware of the conditions necessary for the attainment of achromatism in refracting telescopes, but relied on the accuracy of experiments made by Newton.