Did the spot have any color to it? Try again with a green filter. See you tonight Ed.
Re: Odd star test
Started by ddrake, 07/11/2003 12:37PM
Posted 07/11/2003 12:37PM
Opening Post
Posted 07/11/2003 02:44PM
#1
Mirrors only have the tolerance in the center since they have a central obstruction, the center of the mirror is blocked so an error that is the size or smaller of the obstruction wouldn't affect optical quality.
I remember seeing that image that you describe in Suiter's book, I don't have it handy right now, maybe someone else does? It seems to me it was an indication of a turned edge, but that's for a newt, I'm not sure what the equivalent abberation would be on a refractor, anyone correct me if they know :-)
I just ran the abberator program and set it for zero central obstruction (refractor) I can get close to an intra/extra focal image where there is a black dot in the center by adding some spherical abberation and adjustion the focus waves. How did the rings look between the two sides? Were they fuzzy and mushy on one side and sharp on the other?
Ron
I remember seeing that image that you describe in Suiter's book, I don't have it handy right now, maybe someone else does? It seems to me it was an indication of a turned edge, but that's for a newt, I'm not sure what the equivalent abberation would be on a refractor, anyone correct me if they know :-)
I just ran the abberator program and set it for zero central obstruction (refractor) I can get close to an intra/extra focal image where there is a black dot in the center by adding some spherical abberation and adjustion the focus waves. How did the rings look between the two sides? Were they fuzzy and mushy on one side and sharp on the other?
Ron
Funding Member
