RE: ATM Spider Design

[andydtg@alpha1.phoenix.net]

Bratislav wrote:

>Thinner spiders = less diffraction.

I don't think the thickness of the vanes (or anything else) in the
optical path has anything to do with the amount of diffracted light in
the image plane, it's a function of the length of the edges. The thickness
does affect the amount of obscuration because of the increased area.



Andy Saulietis / DTG Alt-Az-Fp Drive Systems
12617 Harriet Ln
Santa Fe, TX 77510 USA
409-925-8854 Voice/Fax