[ATM] corrected dall-kirkham telescope

[Guy Brandenburg]

Anybody care to comment on the 'corrected dall-kirkham telescope' design?

see 
Corrected Dall-Kirkham
 Employs a spherical secondary and a primary with a conic constant around 0.8  together with a flat field corrector.  Produces a beautiful wide-field  (2°).  Can be used from very fast (f/3.5) to moderate (f/9) systems.   Has the distinct advantage of a spherical secondary which is very easy to  collimate and stay in collimation.  Many R-C systems, although in theory  produce diffraction limited images, are incapable of doing so due to  misalignment of the primary-secondary with tube flexure or due to tube currents  in closed- tube OTA designs.  All ACE telescopes use open-tube truss  designs.






"Thus, from the war of nature, from famine and death, the most exalted object which we are capable of conceiving, namely, the production of the higher animals, directly follows. There is grandeur in this view of life, with its several powers, having been originally breathed into a few forms or into one; and that, whilst this planet has gone cycling on according to the fixed law of gravity, from so simple a beginning endless forms most beautiful and most wonderful have been, and are being, evolved."
- wtote Charles Darwin.
Guy Brandenburg, Washington, DC
My home page on astronomy, mathematics, education:
http://home.earthlink.net/~gfbranden/GFB_Home_Page.html
or else 
http://tinyurl.com/r6fh2