ATM Alternatives to Newtonians

["Chuck Hards" <chuckh@companionsystems.com>]

Rod Brackenridge wrote that the ease of figuring the Gregorian secondary
seems to be it's only advantage.

Additionally, it is easier to effectively baffle than a Cassegrain, and
should boast excellent contrast, if done correctly.

Concieveably, you could design a telescope with the option of all three
optical configurations, by switching secondary assemblies, but the
collimation requirements might make it impractical, if not built to tight
mechanical tolerances.

Chuck Hards