i just got in contact with a US company. They say they can do a 26'' diameter quarter sphere. I told the rep that i'd send him a link to the security mirror...
819
Zack Butterfield
zacksmumdad
Feb 9, 2008 12:01 am
Hi everyone, I've tried something new. I've been taking video off of the mirror for time lapse footage. Along the way I've noticed that a warped grid at 16x9...
820
Paul Bourke
pauldavidbourke
Feb 9, 2008 9:23 am
... out of the mirror? Sorry, it's hard to do something new .... what you describe has already been attempted by myself and others. I'm assuming that your...
821
Paul Bourke
pauldavidbourke
Feb 9, 2008 11:35 am
... out of the mirror? Perhaps my last reply isn't what you are really asking, but in case it is then I have put a diagram here to illustrate my last reply. ...
822
Paul Bourke
pauldavidbourke
Feb 9, 2008 12:17 pm
While I claim to be the inventor of the spherical mirror projection technique, that is strictly only true in the modern digital era. The earliest reference I...
823
Paul Bourke
pauldavidbourke
Feb 10, 2008 5:23 am
I plan to cycle the photo on the front page of this group on a regular basis, starting with the "treehuggers" installation: a small vertical dome that closes...
824
max_roessner
Feb 17, 2008 10:05 pm
Paul, thanks for this information, which I find quite interesting. I've never heard of this 1957 facility in Hamburg and I'd like to learn more about it. Do...
825
Zack Butterfield
zacksmumdad
Feb 21, 2008 5:16 pm
Paul, Hi, I follow what you are saying as far as fitting the mirror within the video frame. But it seems to me that you either fit it "vertically" or...
826
Zack Butterfield
zacksmumdad
Feb 23, 2008 5:25 pm
HD Video off of a mirror: In the past I've used a Sony HD camera that was 1080i. I then captured the movie into iMovie. Unless the image was very bright,...
827
Paul Bourke
pauldavidbourke
Feb 24, 2008 3:09 am
... I don't claim to be a video camera expert but I wouldn't assume that interlaced or progressive would make any difference to a cameras low light response....
828
Trixter aka Bret McDa...
robotdev
Feb 24, 2008 3:37 am
... In the astronomy world its largely attributed to temperature variations which affect resistance of the circuit causing the noise to be present. There are...
829
Tom
txhypnosis
Feb 24, 2008 4:26 am
Hi is anyone familiar with the "A Planetarium for Every Classroom" 5 Meter Cardboard Dome http://www.cccoe.net/stars/5mdome.html ? Specifically has anyone made...
830
Paul Bourke
pauldavidbourke
Feb 24, 2008 7:30 am
... It seems you are correct, see the photo album where I have uploaded the triangle dimensions required fora 5m diameter dome. For the larger triangle you...
831
Kadir ULUÇ
kadir_tug
Feb 25, 2008 12:18 am
Hello, I find this mirror in Australia but the shipng is to much to Turkey. Now I'm lockin for this mirror in Europe. It is possible?...
832
Jeff Adkins
espaceacademy
Feb 25, 2008 12:38 am
Hi, we built the 5 meter dome. The measurements will not fit on the 4x8 cardboard but you can do 2 solutions. One is to make half- triangles and glue them...
833
Paul Bourke
pauldavidbourke
Feb 25, 2008 10:45 am
... At the moment I know of no such supplier. As such you would need to find a local company who can either manufacture the entire solution, or first surface...
834
Thomas Goodey
thomasgoodey
Feb 27, 2008 10:54 am
How can the shipping be high? Surely that mirror is rather small? Thomas Goodey ********************************** I am unfulfilled. Sex does not matter, for...
835
Peter Hartmann
peter_hartma...
Feb 27, 2008 3:08 pm
... Australia's a long way man, unless you're in Australia. P...
836
Thomas Goodey
thomasgoodey
Feb 27, 2008 8:30 pm
... The distance really has very little to do with it. We live on a globalized planet. How large is that mirror anyway? Thomas Goodey ...
837
Peter Hartmann
peter_hartma...
Feb 27, 2008 11:09 pm
... I think you you bring that to the attention of the shipping companies. ;) although they might mention something about fuel costs....
838
fraserneville
Feb 28, 2008 11:02 am
... Australia's a long way even if you're in Australia! Perth is the most isolated city on the planet, and the continent would fit across the gap of the...
839
Trixter aka Bret McDa...
robotdev
Feb 28, 2008 12:42 pm
... lets move it and then build a high speed railway system then ... -- Trixter http://www.0xdecafbad.com Bret McDanel Belfast +44 28 9099 6461 US...
840
Paul Bourke
pauldavidbourke
Feb 28, 2008 1:16 pm
... So, while I'm in Perth .... that most isolated of cities, the mirrors come from Melbourne, that most cosmopolitan of cities. The real issue though is that...
841
Trixter aka Bret McDa...
robotdev
Feb 28, 2008 1:24 pm
... In theory if you are going to get it surface coated, you may be able to give the dimensions to someone who works with acrylics (not the paint but more like...
842
Paul Bourke
pauldavidbourke
Mar 4, 2008 11:49 pm
I have just added three new photos to the "Gravitational Discovery Centre" photo album. This gallery is now open (unlike the earlier construction/testing...
843
chas3701
Mar 8, 2008 8:09 am
Melbourne is a long way from Chichester UK, but the South Downs Planetarium there celebrated Sir Patrick Moore's 85th Birthday with the launch of it's...
844
chas3701
Mar 9, 2008 12:03 am
As Paul Bourke has often pointed out, if you don't use first surface mirrors you will get double reflected images. Such mirrors are very delicate and are...
845
kirill.kornyakov
kirill.korny...
Mar 9, 2008 11:48 am
Hi all! In small_planetarium group usually discussed systems based on single projector and spheric mirror. Our short experiments showed that such system has...
846
Paul Bourke
pauldavidbourke
Mar 9, 2008 11:43 pm
... There are a number of factors that determine the final quality of the result. These are discussed in various places here ...
847
yves lhoumeau
lhoumeauyves
Mar 10, 2008 12:11 am
Hi all, The technique of spherical mirror is a beautiful technique, but not the only one! I successfully completed a fisheye projector low cost, home made, for...
