Photographer's Note

Windmill K near Schermerhorn.

There was a full moon so I decided to attempt a 2s high iso moonscape, and to my fortune there were still some windmills turning. With the moonlight on the sails it might help to create a round blur. The 2s exposure had the advantage that you get a start/stop kind of blur instead of a continous round blur.
The effect of the wings is not like a propellor in a video, altough it loos the same. A propellor in a video with this effect is a result of the filmspeed (frame to frame) in relation to the propellorspeed.
The wings of this windmill were not rotating fast, they were actually rather slow. The effect is a result of turning trough the dead point of the wings. The rotation is not a continous speed, it slows down when a wing comes near the top and speeds up when it falls down.
You can only see this with middle-long shutterspeeds like 2 seconds. In 15 and 30 seconds exposures the wings have passed so many times that they become one perfect circular blur.
Near full moon behind me, parly cloudy and the sun sets in the background of the windmill. Despite the look of the photo it was very dark (night dark, with moon fill light) and there was no sun to be seen anymore (surprised me what turned up in the background). Couldn't read the markings on the camera or lens and despite my f/1.4 lens (bright for me and the focus system) it just wouldn't focus.
To focus it I did 30s ISO 200 long exposures with trial and error focussing. When it finally looked ok I set the 2s exposure and fired away. Did this from various angles.

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Additional Photos by Sander Admiraal (Azrifel) Silver Star Critiquer/Gold Note Writer [C: 17 W: 2 N: 121] (846)
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