By Dave Fuller on 11/12/2012 7:44 PM

Curved vane spider on template

Reflectors always seem to pose a challenge to the visually obsessed among those in the amateur astronomy community.  Unless you are building a Herschelian or offset-axis reflector - in other words, one with no central obstruction - then there is always the problem of the best way to place that obstruction in the light path with as little diffraction occurring as possible.  Some don't mind the straight, four or six diffraction spikes caused by typical 4-vane or 3-vane spiders, and to be honest, they don't really bother me all that much.  In fact, that may be the direction I go.  But something that has intrigued me for quite a long time is the curved spider.  Oh, believe me, if I could figure out a way to afford an optical window for my reflector, I wouldn't hesitate.  So the curved spider is the next best thing.

What is a "curved spider" you ask?  Glad you did.

The Nightlight

This blog includes what to see in the night and daytime skies, thoughts on telescopes, binoculars, and other astronomy observing accessories and equipment, plus my own occasional notes on objects I've seen and observed. Oh, and the random theater or other "my take on life" post. In other words, there is always something interesting. Check it out.