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...
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...
... 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...
... 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. ...
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...
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...
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...
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...
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,...
... 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....
... In the astronomy world its largely attributed to temperature variations which affect resistance of the circuit causing the noise to be present. There are...
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...
... 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...
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...
... 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...
How can the shipping be high? Surely that mirror is rather small? Thomas Goodey ********************************** I am unfulfilled. Sex does not matter, for...
... 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...
... 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...
... 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...
I have just added three new photos to the "Gravitational Discovery Centre" photo album. This gallery is now open (unlike the earlier construction/testing...
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...
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...
Hi all! In small_planetarium group usually discussed systems based on single projector and spheric mirror. Our short experiments showed that such system has...
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...
