RE: ATM 3-Vane or 4-Vane Spiders

["Mel Bartels" <mbartels@efn.org>]

>>>
 I insulated two vanes of a four vane spider with Black Flocked Paper to
see if I could demonstrate any thermal effects on the diffraction
spikes. Even though the insulated vanes had a thicker profile the
corresponding spikes appeared dimmer and were thinner and longer. Unless
I looked at the wrong spikes (I don't think so) I think the temperature
difference of the vanes does effect the size of the diffraction spikes.
<<<


You might check the archives.  I related the experience on my 20 inch
where I cut out the center of the metal vanes and subjectively thought I
noticed a reduction in the intensity of the spikes.

Mel Bartels