What can any one tell me about the parabolical mirror such as there pro's and con's..also interested in your experience with them....
parabolical mirror
Started by claymuck, 04/01/2004 03:09AM
Posted 04/01/2004 03:09AM
Opening Post
Posted 04/01/2004 02:06PM
#1
Assuming you're talking about Newtonians, paraboloids are the only way to go unless you're talking extremely long focal ratios in which case a sphere will work. Plus if you want a sphere then you must go longer with increasing aperture. For example, a 4" f/10 sphere is "diffraction limited" but an 6" f/10 sphere is not. The bottom line is that at most practical apertures and focal ratios the paraboloid is the only game in town.
