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Old 23-05-2007, 11:02 PM
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ballaratdragons (Ken)
The 'DRAGON MAN'

ballaratdragons is offline
 
Join Date: Jan 2005
Location: In the Dark at Snake Valley, Victoria
Posts: 14,412
Fun with Diffraction Spikes!

I made up a Diffraction Spike maker thingo to see if I could put Diffraction Spikes on my pics.

Anything to distract from those big blobby stars that webcams create.

I started with the old fishing line trick, but that didn't show up.

Then I tried 5mm wide cardboard stips. They only just faintly showed up on the brightest stars. So I tried 12mm cardboard stips.

Yep, works (sort of), but because the wider strips took up so much of the apature, I had to take much longer exposures. For example, the Carina image usually takes 180 seconds. This one took 300 seconds to get the same image.

One interesting thing I noticed during this experiment was that Orange stars diffract easily, whereas white ones are a let-down!!!!!

Oh well, I had fun mucking about

1. the Diffraction Spike maker thingo I made.
2. Carina with diffraction spikes
3. Antares with diffraction spikes
4. Jewel Box with diffraction spikes
5. Gacrux with diffraction spikes.
Attached Thumbnails
Click for full-size image (Diffracttion spike maker mask.jpg)
43.0 KB64 views
Click for full-size image (Carina Neb Diff Spik 22 May 2007 1.jpg)
121.5 KB94 views
Click for full-size image (Antares 60 seconds 1.jpg)
86.8 KB72 views
Click for full-size image (Diffraction Jewel Box single 22 May 2007 1.jpg)
95.1 KB78 views
Click for full-size image (Gacrux 80 seconds 1.jpg)
110.4 KB60 views
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