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Group Information

  • Members: 304
  • Category: Telescopes
  • Founded: Sep 25, 2007
  • Language: English
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Activity within 7 days:

1 New Member - 3 New Messages - 3 New Files - New Questions

Description

A discussion group on schiefspieglers, Herschellian, CHiefspieglers, Yolos, off-axis Newtonians and other such scopes.

My second attempt at making a sandwich mirror. My first attempt was a 10 inch mirror but not all the bonds were good probably due to different thickness spacers. Destructive testing showed some bonds broke easily and some stronger than the glass itself. This is a 16 inch mirror made of 2 3/4 inch plates using silicon bonding and this time I ground all the spacers to the same thickness.

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Re: Stevick-Paul binocular design
... I am thinking along the line of using two 8" f15 paraboloid primaries with appropriate convex spherical secondaries and matching concave tertiaries, then
Posted - Thu May 24, 2012 9:09 pm
 Carl Anderson
stressedglass
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TESTING GLASS FOR STRESS
Stephen Richard is the owner/principal of Verrier studios in Glasgow, Scotland. While accomplished as an artist and a respected authority on working with
Posted - Thu May 24, 2012 6:10 pm
 artbianconi
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Venus transit
Any club or group planning a public viewing of the Venus transit should consider a solar projector. These are the simplest and the best:
Posted - Mon May 21, 2012 2:07 am
 Ed
opticsed
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Re: Stevick-Paul binocular design
Keith, My low power eyepiece is a wide field 2"diameter 40mm FL.  The views are amazing.  It's just a personal favorite of mine. Definitely, design the scope
Posted - Sun May 20, 2012 2:44 am
 Carl Anderson
stressedglass
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Re: Stevick-Paul binocular design
Sound very attractive Carl. Yes, limiting to four surfaces max in each OTA is important. I liked that Yolo design (and appreciated everything else in your
Posted - Sat May 19, 2012 8:02 pm
 Keith
tirakinz
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Message History

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
2012 12 46 57 74 24
2011 115 67 25 55 88 95 85 70 95 69 55 152
2010 165 45 83 132 46 77 51 20 15 23 62 165
2009 14 79 9 17 55 43 25 118 129 94 23 146
2008 9 9 18 4 6 11 6 122 31 1 36
2007 1 4 3 1
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