Modified Dall-Kirkham telescope
- Modified Dall-Kirkham telescope
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. Usable fields is much better than the RC telescope, and over very wide spectral bands, typically 0.38 to 0.95 micrometres if the corrector is made of quartz.
Such a telescope was designed by Rosin and Wynne after WWII. The performances are equal or better than the Ritchey-Chretien telescope. The spherical secondary can be fringe tested against the spherical calliper or tested from behind. This is markedly an advantage over the hyperbolic secondary of the RC. There are some observatories using such optical combination.
For a description of such a telescope and is performances:
http://astrosurf.com/astroptics/le_telescope_de_wynne-rosin.html
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