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The Modified Dall-Kirkham telescope utilizes an elliptical primary and spherical secondary mirror as in the conventional Dall-Kirkham configuration, but also includes a lens group (usually two or three lens elements) ahead of the focal point to improve off-axis image quality. The primary mirror conic constant is slightly different from that for a conventional Dall-Kirkham and must be optimized along with the lenses during design.

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  • The Modified Dall-Kirkham telescope utilizes an elliptical primary and spherical secondary mirror as in the conventional Dall-Kirkham configuration, but also includes a lens group (usually two or three lens elements) ahead of the focal point to improve off-axis image quality. The primary mirror conic constant is slightly different from that for a conventional Dall-Kirkham and must be optimized along with the lenses during design.
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