I went to the Australian Open tennis today to take photos and have hit a problem that I cannot explain. Have a look at these photos and you will see some quite bizarre distortion. This only affects the subject that is in fast motion (the background is fine and photos of stationary players are fine). You will see the obvious distortion of the racket, but in other photos the players arms look like they are bent or dislocated. This clearly isn't normal motion blur and I have used this camera for fast moving sports action before with no issues. it also isn't barrel distortion since these were shot at a focal length of 150mm (300mm full frame equivalent) I took around 2800 photos and this problem seems to occur right throughout those that involve fast motion. Camera: Olympus OMD EM1 with 40 - 150mm PRO lens Shutter Priority at 1/2000th sec Silent shutter mode (I tried mechanical shutter but that didn't fix it) Recent firmware upgrade completed Any idea what is going on? Notice how the racket does not only appear bent but it also appears huge in comparison to her body size (shot with a long telephotos lens perspective should be compressed) This racket looks like it is made out of rubber in this photo!! This lady in pink shorts does NOT have an arm that looks like that, I can assure you!!