High Quality Content by WIKIPEDIA articles! The Modified Dall–Kirkham telescope utilizes an elliptical primary and spherical secondary mirror as in the conventional Dall–Kirkham configuration, but also includes two lens elements ahead of the focal point to improve off-axis image quality. The primary mirror conic constant is slightly different than that for a conventional Dall–Kirkham and must be optimized along with the lenses during design. The usable field is much better than the Ritchey– Chretien telescope without corrector, and over very wide spectral bands, typically 0.38 to 0.95 micrometres if the corrector is made of quartz. The Ritchey Chretien System with corrector has a better and bigger field.

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