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 behin

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 https://www.youtube.com/watch?v=wOUuj1LQRyk [1] it could use some image stabilisation though.