Achromat Objective Lenses

As light passes through any lens, each wavelength comes into focus at a different distance from the lens (red at the farthest point, green in the middle, and blue at the nearest point). This phenomenon is referred to as chromatic aberration. Achromatic objectives are engineered to bring the red and blue wavelengths into focus at nearly the same point, greatly reducing the depth of the overall focal plane and producing sharper detail for all colors.

Achromat objectives are often engineered for correction of monochromatic aberrations and require green light for the greatest degree of correction (4). Thus, use of a monochromatic green interference filter greatly reduces the incidence of both chromatic and monochromatic aberrations experienced with achromat objectives.

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