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Group Information

  • Members: 212
  • Category: Telescopes
  • Founded: Sep 25, 2007
  • Language: English
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Activity within 7 days:

21 New Messages - New Questions

Description

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


Here's an 8 inch Maksutov-Herschelian I made some years ago. It used a wedged corrector made of 2 lenses cemented together offset. It isn't as good off axis as the Chief.

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Alternative substrate for Pyrex, made in Canada
Shortly after Corning announced suspension of activity at their Pyrex rolling kiln in the U.K., I saw samples of a substitute glass from a manufacturer in
 9 __A_YAHOO_USER__
artbianconi...
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Difference in length between F/L of mirror and site axis total in CH
Hi Ed! I verified the coordinates for all the optical components in the CHIEF. They match your spread sheet perfectly. I drew a line from the origin of the
 2 Peter De Baan De Baan
pdebaan
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Who is Laurie?
Laurie is actually a mispelling of Robert LURIE. It is a shame that a person does some great work in lens-mirror design and folks won't show the courtesy of
 9 mdhopt53
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How modular is "Modular" when building a 12.5" F-8 Ed Jones CHIEF?
I discovered a position error in the location of the secondary in the 3D engineering model. My error not Ed's. It was easy to correct; I'd used the wrong datum
 1 "Mr. Wizard!"
artbianconi...
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Component Interference inside the wedge of the lens boards
Because the lens boards are on a common hinge , they form a wedge. There isn't a lot of room at the top, inside the "wedge" near the hinges. I realized this
 5 "Mr. Wizard!"
artbianconi...
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2010 165 21
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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