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pflanze
on Nov 23, 2014
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Schlieren Optics – See small changes in the index ...
Or the effect you can see after about second 30 in the following pretty[1] video of a plane passing in front of a mountain range (the narrow band of light behind it works well enough as a collimator).
https://www.youtube.com/watch?v=wOUuj1LQRyk
[1] it could use some image stabilisation though.
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Search:
https://www.youtube.com/watch?v=wOUuj1LQRyk
[1] it could use some image stabilisation though.