Tom Mann
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I'm 99.9% sure that he must have taken a large number of short-to-medium length exposures (each, a max of a few seconds) over a long period of time (many minutes), and then stacks them together digitally using the "Lighten" layer blending mode. This technique is now the standard for long exposures of the night sky to get star trails, and there is even specialized software (some free) available to do this. This technique would also explain (at least partially) the unique "starting edge" seen many of his clouds.
I also strongly suspect that he used manual exposure mode and changed the aperture between individual shots (ie, over the long duration) to get the very nice fade-out effects.
I'm less sure of this, but if there is not enough sharp detail that is consistent from one exposure to the next in the stack, I can easily imagine that he would consider putting a series of radiating dark, narrow lines on the top layer, change its blending mode to multiply, adjust the opacity to taste, and paint them in where there are clouds or wherever he saw fit to do so.
Just my $0.02,
Tom
I also strongly suspect that he used manual exposure mode and changed the aperture between individual shots (ie, over the long duration) to get the very nice fade-out effects.
I'm less sure of this, but if there is not enough sharp detail that is consistent from one exposure to the next in the stack, I can easily imagine that he would consider putting a series of radiating dark, narrow lines on the top layer, change its blending mode to multiply, adjust the opacity to taste, and paint them in where there are clouds or wherever he saw fit to do so.
Just my $0.02,
Tom
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