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Post by Ron Walker on Aug 30, 2022 17:01:05 GMT -7
Posted by: mrgare5050 Aug 8 2017, 02:28 AM
So on my recent trip I found a book of 'shadow projections' of famous nursery rhymes, and in them of course were
star light, star bright, first star I see tonight. that ones easy but
twinkle twinkle little star, how I wonder what you are
Stars twinkle because … they’re so far away from Earth that, even through large telescopes, they appear only as pinpoints. And it’s easy for Earth’s atmosphere to disturb the pinpoint light of a star. As a star’s light pierces our atmosphere, each single stream of starlight is refracted – caused to change direction, slightly – by the various temperature and density layers in Earth’s atmosphere. You might think of it as the light traveling a zig-zag path to our eyes, instead of the straight path the light would travel if Earth didn’t have an atmosphere
How can TWINKLING be demonstrated? I need a twinkler. Not for all the stars, just one maybe. A small twinkler.
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Post by Ron Walker on Aug 30, 2022 17:01:56 GMT -7
Posted by: Ron Walker Aug 8 2017, 09:23 AM
How about a single projected star through a rotating clear CD or DVD with small drops of clear Duco (sp?) cement on it. Very thin little drops. The star would then be projected normally until it was refracted by the cement.
You could also surround your light source in your projector with some window screen material and rotate it around the lamp. All the stars should twinkle then. Worth the experiment to see how fine of mesh would be required for the best effect.
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Post by Ron Walker on Aug 30, 2022 17:02:24 GMT -7
Posted by: mrgare5050 Aug 9 2017, 02:32 AM
QUOTE(Ron Walker @ Aug 8 2017, 04:23 PM) *
How about a single projected star through a rotating clear CD or DVD with small drops of clear Duco (sp?) cement on it. Very thin little drops. The star would then be projected normally until it was refracted by the cement.
You could also surround your light source in your projector with some window screen material and rotate it around the lamp. All the stars should twinkle then. Worth the experiment to see how fine of mesh would be required for the best effect.
that second idea will get a try, Mr Twinkle !
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Post by Ron Walker on Aug 30, 2022 17:02:43 GMT -7
Posted by: moonmagic Aug 10 2017, 07:23 AM
I once heard that Minolta used rotating chicken wire surrounding the lights sources at each globe? mm
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Post by Ron Walker on Aug 30, 2022 17:03:12 GMT -7
Posted by: Ron Walker Aug 10 2017, 11:50 AM
The only problem with that is when it stops it would leave a substantial number of stars in the dark, so to speak.
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Post by Ron Walker on Aug 30, 2022 17:03:37 GMT -7
Posted by: moonmagic Aug 10 2017, 03:32 PM
What does your machine use to cause the twinkle? mm
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Post by Ron Walker on Aug 30, 2022 17:04:13 GMT -7
Posted by: Ron Walker Aug 11 2017, 09:34 AM
QUOTE(moonmagic @ Aug 10 2017, 03:32 PM) *
What does your machine use to cause the twinkle? mm
I have no twinkle. I'm not really after that much accuracy. Or, it didn't come with the machine so I don't miss it.
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Post by Ron Walker on Aug 30, 2022 17:04:39 GMT -7
Posted by: moonmagic Aug 11 2017, 10:00 AM
Oh come on! I'll bet you've got a twinkle in your eye every time you do a show or when you are creating a new special effect! mm
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Post by Ron Walker on Aug 30, 2022 17:05:01 GMT -7
Posted by: Ron Walker Aug 11 2017, 10:25 AM
QUOTE(moonmagic @ Aug 11 2017, 10:00 AM) *
Oh come on! I'll bet you've got a twinkle in your eye every time you do a show or when you are creating a new special effect! mm
How can I twinkle in the dark. I must admit however that I really do enjoy giving these presentations.
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Post by Ron Walker on Aug 30, 2022 17:05:22 GMT -7
Posted by: mrgare5050 Dec 17 2019, 05:18 PM
QUOTE(Ron Walker @ Aug 8 2017, 04:23 PM) *
How about a single projected star through a rotating clear CD or DVD with small drops of clear Duco (sp?) cement on it. Very thin little drops. The star would then be projected normally until it was refracted by the cement.
You could also surround your light source in your projector with some window screen material and rotate it around the lamp. All the stars should twinkle then. Worth the experiment to see how fine of mesh would be required for the best effect.
here, I thought we'd talked twinkle ...
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Post by Ron Walker on Aug 30, 2022 17:05:46 GMT -7
Posted by: Ron Walker Dec 17 2019, 07:11 PM
QUOTE(mrgare5050 @ Dec 17 2019, 05:18 PM) *
here, I thought we'd talked twinkle ...
There are many different twinkles. But twinkling stars are just bad air movement.
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