Image of the day

From the
ATWB Customer Gallery

Venus Transit and Plane

My Account

New to Astromart?

Register an account...

Need Help?

Details on Meade's LX800 ACF design

Started by JJM, 04/13/2012 02:27PM
Posted 04/13/2012 02:27PM Opening Post
An appendix in the user manual for Meade's new LX800 ACF scopes offers interesting details on the optical design:

"In the ACF design shown above, light enters from the right, passes through a thin lens with 2-sided aspheric correction (“correcting plate”), proceeds to a spherical primary mirror, and then to a hyperbolic secondary mirror."

This is the first time I've seen any mention of a two-sided figure on the corrector plate, and the first confirmation that the figure used on the secondary mirror is a hyperbola. The two-sided corrector must be made using a different process than the single-side figure used on a traditional Schmidt corrector.

Page 55 in:

Jim McSheehy
Posted 04/14/2012 06:30PM #1
I have old Meade literature that shows the same: they use a double-sided corrector (Celestron is single sided), and that the secondary is a hyperboloid. I think they have used this design since their first SCTs in the 1980's.