21. It's more like index of refraction and chromatic aberration as it can be frequency dependent. 22. Compared to Tessar design, its faster aperture and lower chromatic aberration was a significant improvement. 23. The chromatic aberrations are corrected almost perfectly resulting in very high image contrast and resolution. 24. He invented the feathering spectrograph by using the commonly occurring chromatic aberration to his advantage. 25. It is harder to correct chromatic aberrations over wider spectral ranges without further optical complexity. 26. It also utilizes achromat glass Plossl configuration ) to prevent chromatic aberration , producing a clearer image. 27. The focal length for different wavelengths will also differ slightly, and this is called chromatic aberration . 28. Catoptrics and optical fiber have no chromatic aberration , while dioptrics need to have this error corrected. 29. This lens dramatically improved sharpness and chromatic aberration , and is especially good at close focusing distances. 30. Chromatic aberration is measured by the Abbe number.
