Re: Single or multi hole off-axis filters?

From: Jon Isaacs (jonisaacs_at_aol.com)
Date: 06/10/04 

Date: 10 Jun 2004 01:01:39 GMT

>If you make a mask with a collection of randomly located holes, you will see
>that same pattern reflected in the multiple star images when out of focus.
When
>in focus, you will see a single star image. But note that at high
magnification, you will see a distinctly non-circular diffraction pattern
around this single >star image.

Thanks Chris and Brian for explaining this too me. This explanation is
something I can grab ahold of, it makes intuitive sense to me.

So, what do you guys think about using a 4 hole mask to get rid of the
Newtonian diffraction spikes while retaining as much mirror surface and
resolution as possible?

jon