Because of my job I take lots of photos of people and wind turbines. This means photos outdoors, lots of contrast, and no option to arrange people. I take what I can get. I use a combination of smartphone, point-and-shoot, and a mirrorless MFT Olympus (the best camera is the on you have in your pocket).
I've just come back from a trip and found that lots of my pictures have ghost turbines in them - they look like double exposures because the rotors of the turbines appear to be rotated slightly, but are much fainter. Because the blade tips are moving about 80 m/s, I think the ghosting is separated by maybe 1/10 of a second, maybe more. The image below is a zoom in to the area where the turbines are.
This photo was taken with a 2-year old smart phone. The exposure is f/2.25 1/3571 4.235 mm ISO50.
What is happening, and how could I avoid this in future?
I also recently bought an Olympus OMD E-M10 mark III with stock 14-42 mm pancake. I've not noticed this happening with that camera, but would like to know how I could avoid it - with that camera I generally try to use smaller apertures and keep exposures as short as possible, but what else can I do?