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In optics, chromatic aberration (CA, also called achromatism or chromatic distortion) is a type of distortion in which there is a failure of a lens to focus all colors to the same convergence point. It occurs because lenses have a different refractive index for different wavelengths of light (the ...

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What kind of chromatic correction has the Pentax M 50mm f/1.7

http://www.kenrockwell.com/pentax/35mm/lenses/50mm-f17-smc-m.htm After the chromatic aberrations that I observe, it could be an achromat.