Table of contents :
Dall Kirkham 200 mm F/4- F/15, Mewlon 210 F/2.9-F11.9 and Mewlon 250 F/3-F15
Gregory 250 mm F/3.2-F/28.4
Cassegrain 200 mm F/4-F/15 and Cassegrain 350 F4.9-F29.2
Celestron "classic" and Edge-HD versions overview
Celestron 8 classic and Edge-HD
Celestron 14 with optimized Schmidt plate position
Celestron 8 with optimized Schmidt plate position
Celestron 14 classic and Edge HD
CDK 355 mm F3 - F11.8
OLSO model :
- The model of the C8 Edge-HD is from . It is reported the specifications were provided by Celestron to the authors of .
Radius of diffraction limited flat field :
- 0.25° from 465 to 656 nm according to Celestron WhitePaper and .
Field curvature :
- the C8 Edge-HD is designed to provide a flat-field..
Sensitivity to backfocus :
Strehl ratio versus wavelength :
Simulations with the OSLO model shows that the C8 Edge-HD is diffraction limited on axis from about 485 nm to beyond 900 nm. The performance drops below 450 nm because of spherochromatism.
Focus versus wavelength (to be updated):
Return to home page