Expect to pay at least $ 500 to $ 1, 000 for a good apochromat.
2.
Note, better-than-apochromat lenses are available for scientific / military / industrial work.
3.
An apochromat is a lens or lens system with even better chromatic aberration correction, combined with improved spherical aberration correction.
4.
The Kern Macro Switar lens was a 50 mm lens at F1.8 or F1.9 . It was an apochromat, and is still highly regarded as possibly the best standard lens ever offered.
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