http://tech.groups.yahoo.com/group/small_planetarium/ Small or Portable Planetarium Group Thu, 02 Jul 2009 15:17:15 GMT Karrie Berglund http://tech.groups.yahoo.com/group/small_planetarium/message/1435 http://tech.groups.yahoo.com/group/small_planetarium/message/1435 Hi Adam et al, In case you're not already aware of these, we have more than a dozen free lesson plans posted on our website: Thu, 02 Jul 2009 05:23:27 GMT Adam Goss http://tech.groups.yahoo.com/group/small_planetarium/message/1434 http://tech.groups.yahoo.com/group/small_planetarium/message/1434 Hi everyone.  I have been working on developing an outreach program through Colorado State University utilizing Planetariums.  I have started a 'DIY Tue, 30 Jun 2009 12:21:49 GMT Jack Dunn http://tech.groups.yahoo.com/group/small_planetarium/message/1433 http://tech.groups.yahoo.com/group/small_planetarium/message/1433 ... As Paul says, what manufacturers list as contrast is sometimes not close to reality. Projectors that are not as bright can be listed to have more contrast Tue, 30 Jun 2009 12:15:26 GMT Paul Bourke http://tech.groups.yahoo.com/group/small_planetarium/message/1432 http://tech.groups.yahoo.com/group/small_planetarium/message/1432 ... I forgot to comment on this.... There are very few people indeed for which a 1920x1920 fisheye would be appropriate, namely those with a 4Kx2K projector Tue, 30 Jun 2009 10:00:56 GMT Paul Bourke http://tech.groups.yahoo.com/group/small_planetarium/message/1431 http://tech.groups.yahoo.com/group/small_planetarium/message/1431 ... I was referring to the Optoma Ep1080 which is 3600 ansi lumens. ... Hard to tell, these rating are imprecise. ... Indeed. ... The Optoma Ep1080 is about Tue, 30 Jun 2009 08:35:17 GMT Lionel RUIZ http://tech.groups.yahoo.com/group/small_planetarium/message/1430 http://tech.groups.yahoo.com/group/small_planetarium/message/1430 Hello Paul and others, ... Yes indeed: 3850 Lumens versus 2000 Lumens for the Optoma HD800X LV But what about the contrast? The Dell is precised 2700:1 versus Tue, 30 Jun 2009 03:32:38 GMT Paul Bourke http://tech.groups.yahoo.com/group/small_planetarium/message/1429 http://tech.groups.yahoo.com/group/small_planetarium/message/1429 A short note regarding compatible projectors for spherical mirror projection ... the Dell 7609WU. It is WUXGA which is 1920x1200. Slightly brighter than the Mon, 29 Jun 2009 10:15:56 GMT Paul Bourke http://tech.groups.yahoo.com/group/small_planetarium/message/1428 http://tech.groups.yahoo.com/group/small_planetarium/message/1428 ... Both. Mon, 29 Jun 2009 01:33:39 GMT Andy Dolph http://tech.groups.yahoo.com/group/small_planetarium/message/1427 http://tech.groups.yahoo.com/group/small_planetarium/message/1427 so is this something that's intended to be viewed from the outside? Andy Mon, 29 Jun 2009 01:20:11 GMT Paul Bourke http://tech.groups.yahoo.com/group/small_planetarium/message/1426 http://tech.groups.yahoo.com/group/small_planetarium/message/1426 I've just uploaded a couple of photos of a semi transparent inflatable dome by a John McCormick. Quite small at 3.75m but he tells me it was mainly a test of Fri, 26 Jun 2009 01:20:09 GMT Eduardo http://tech.groups.yahoo.com/group/small_planetarium/message/1425 http://tech.groups.yahoo.com/group/small_planetarium/message/1425 Hi In Cubic folder I upload 6 files in high resolution for print and do a negative photolite. the faces of the cube can be printed in desired size, by default Thu, 25 Jun 2009 10:36:19 GMT mareibauer http://tech.groups.yahoo.com/group/small_planetarium/message/1421 http://tech.groups.yahoo.com/group/small_planetarium/message/1421 Hi everyone, Are you up for a trip through 3000 years of history of astronomy? We are proud to present our latest fulldome production: ASTRONOMY: 3000 YEARS OF Thu, 25 Jun 2009 01:09:02 GMT ltkhoover http://tech.groups.yahoo.com/group/small_planetarium/message/1420 http://tech.groups.yahoo.com/group/small_planetarium/message/1420 This looks like a Spitz Starscape. 12 were made, at least one other is still installed in a planetarium in Kansas City. 4' diameter, 14000 stars! Wed, 24 Jun 2009 03:46:13 GMT Paul Bourke http://tech.groups.yahoo.com/group/small_planetarium/message/1419 http://tech.groups.yahoo.com/group/small_planetarium/message/1419 ... Jack Dunn is quite correct, the mirrors you are referring to seem to be the same as the ones Acrl provide before the first surface coating is applied. Wed, 24 Jun 2009 02:29:01 GMT Jack Dunn http://tech.groups.yahoo.com/group/small_planetarium/message/1418 http://tech.groups.yahoo.com/group/small_planetarium/message/1418 ... Sorry, but those are steel-_backed_, The surface you would use in projection is not first surface. -- Clear DARK Skies Jack Dunn - Mueller Planetarium