PDA

View Full Version : Telescopes.



Reelmaster
06-24-2004, 01:29 AM
Hi Guy's I see from time to time there are various posts related to Telescopes & Associated items,on this site.
For those interested in this field my old Friend & Machining Mentor Laurie Hall , Master Machinist & Mfg of Facetting Machines has some great info on his web-site that may interest some in relation to his pet hobby

This can be veiwed at www.turbofast.com.au/astrotel. (http://www.turbofast.com.au/astrotel.)

Hope you find it interesting

Best Regards. Jack Erskine.
www.jackerskine.com (http://www.jackerskine.com)

JimH
06-24-2004, 10:08 AM
Be sure to remove the period at the end of the web address.

Lotsa interesting stuff to read.
Thanks,
Jim

Evan
06-24-2004, 11:22 AM
His site is where I found the idea for the spider on my telescope that I completed last year. It is as solid as if the secondary were mounted on a metal plate yet obscures almost no aperture. I calculate it at around .4% for the spider vanes. They are under high tension and are made from hardened steel shim stock .012 thick, then sandblasted and phosphated black. They produce only the faintest of diffraction spikes.

These pics are before the telescope was anodised flat black.

http://vts.bc.ca/img/spider1.jpg

http://vts.bc.ca/img/spider2.jpg