Achromatic Objective Spare Achromatic Objective Spare – Laboratory Equipment The most common type of achromatic is the achromatic doublet, which is composed of two individual lenses made from glasses with different amounts of dispersion. Typically, one element is a negative (concave) element made out of flint glass such as F2, which has relatively high dispersion, and the other is a positive (convex) element made of crown glass such as BK7, which has lower dispersion. The lens elements are mounted next to each other, often cemented together, and shaped so that the chromatic aberration of one is counterbalanced by that of the other. Superior Quality Features: Easy to use Perfect design Easy installation Available in : 5 X, 10 X, 45 X
