Achromatic Doublet Lenses Wholesale Price tells you how that can have sharper imaging and superior energy throughput. Achromatic Doublet Lenses Wholesale Price tells you that since the on-axis performance of an achromat is not degraded by using a larger clear aperture, "shrinking" of the optical system is unnecessary.

Achromatic Doublet Lenses Wholesale Price tells you that "reducing" the aperture refers to reducing the aperture of the lens, such as through a pinhole or aperture, to improve the overall performance of the lens. By fully utilizing the entire clear aperture, achromatic lenses and achromatic lens systems achieve greater speed, higher performance, and greater functionality than equivalent systems using singlet lenses.
Ordinary achromatic lens refers to a lens group that corrects the chromatic aberration of light of three wavelengths (blue light, green light, and red light). Because the blue image of the light converged by the converging lens is close to the focal point, and the concave lens has a high divergence rate for blue light, the chromatic aberration of the two mirrors is opposite so that the red and blue color images can be superimposed into one, and the chromatic aberration is basically eliminated. The crescent-shaped surface limits spherical and coma aberrations. But there are astigmatism and distortion. In the early days, it was mostly used for shooting landscapes, hence the name landscape lens. The shape is crescent (concave-convex), and it is made of two lenses with different refractive indices and dispersion rates. Since then, multilayer bonded achromatic lenses have appeared.
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