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bigdob · Big dobsonian telescope users.
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Group Information

  • Members: 2216
  • Category: Amateur
  • Founded: Jun 20, 2000
  • Language: English
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Activity within 7 days:

4 New Members - 1 New Message

Description

This is a place to discuss using, choosing, modifying, accesorizing, building and observing with big dobsonian telescopes.

This group welcomes discussions of what is unique to using big dobs of any make.

Oh, yeah. We also get to discuss what "big" means.

Polite comparisons of features, performace, usability and seviceablity of big dobs from different manufacturers is specifically *NOT* forbidden. (Note that some brand-specific telescope groups discourage such comparisons. This group does not.)

All postings must be civil. Off topic postings must be humorous, friendly and rare. This group is retro-moderated. Off topic posters will be moderated or deleted. Please read the policy.

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Re: Mirror cell dimensions with Plop
Under the "graphical plots" PLOP gives you the location of the various points on each part - the center, the ends etc. - in cartesian coordinates relative to
Posted - Tue Dec 2, 2008 12:43 pm
 jpcannavo
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Re: Where?
It isn't possible to make a 68 degree field of view with true orthoscopy (zero angular magnification distortion and zero rectilinear distortion), so, from an
Posted - Thu Nov 27, 2008 3:32 pm
 pensack1
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Re: Where?
... WG: Frank, you mighty check University to see what they are offering these days. As stated, these will necessarily be of a longer focal ratio to justify
Posted - Wed Nov 26, 2008 5:30 pm
 Wayne G
missyy9
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Re: Where?
... That must diverge pretty blatantly from a traditional ortho design to get a 68 deg FOV. -John
Posted - Wed Nov 26, 2008 8:48 am
 John Mahony
jmmahony
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Re: Where?
Those would be pretty rare. With only about a 40-45 degree FOV, there's no need for 2" format unless they're extremely long focal length. But orthos are used
Posted - Wed Nov 26, 2008 8:45 am
 John Mahony
jmmahony
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Message History

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
2008 161 45 125 127 75 106 75 59 24 114 40 1
2007 102 66 200 107 133 113 95 190 134 121 306 178
2006 322 217 117 176 112 73 137 52 129 82 152 111
2005 148 206 136 116 198 247 549 359 263 269 239 405
2004 563 342 309 298 137 263 257 134 269 93 120 361
2003 241 139 183 149 302 308 220 207 373 512 229 262
2002 149 186 249 260 124 92 157 154 219 295 814 263
2001 166 149 99 66 136 168 209 289 98 58 104 183
2000 33 105 87 35 95 103 136

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