Greetings,
Celestron is releasing a new set of SCT telescopes called EdgeHD , here is the blurb from Celestron. I like the new color..
http://www.celestron.com/creative/090707-HD-DL/images/1400HD.jpgptical tube

The EdgeHD is Celestron’s latest innovation that will surely be the system of choice for the serious astro-imagers. The new EdgeHD telescope series features an Aplanatic Schmidt optical system that produces pinpoint star images all the way to the edge of the field. Some optical systems currently on the market may produce coma free images. But there is a difference.

*The Optical Difference*
Not only is the EdgeHD coma free, but it also has a built in field flattener to ensure sharp focus all the way to the edge of the field, producing true Astrograph quality images. This results in pinpoint, */High Definition/* star images throughout your astro photograph.

The product is scheduled to be announced formally July 15..

Aplanatic:


free from or corrected for spherical aberration; "an aplanatic mirror"
optics - the branch of physics that studies the physical properties of light
corrected - having something undesirable neutralized; "with glasses her
corrected vision was 20:20"
Based on WordNet 3.0, Farlex clipart collection. © 2003-2008 Princeton
University, Farlex Inc.

Thanks
Tony