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: http://meade.com/software-manuals/telescope-manuals/lx-series?download=15:lx800
"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: http://meade.com/software-manuals/telescope-manuals/lx-series?download=15:lx800
Jim McSheehy