I am stumped. I have a Alienbee B400 triggered by an inexpensive (cheap) wireless trigger. Using my E-PL1 at any speed above 1/100th of a second results in non-random strips of diagonal lines every time I kick it up every 1/3 of a stop to 1/200 (I do know the sync speed listed is only 1/160). Also these lines are diagonal, maybe twenty pixels in length, and only run across the top of the resulting image left to right. The diagonal lines are not random noise or the shutter curtains. Also, the center of the image has a very slight vertical striping pattern. Here's what I know: The E-PL1 only has this issue above 1/100th, and using the pop up flash to trigger the Alienbee optically has no such lines right up to 1/160th. Same wireless trigger setup on an Nikon D60, no such problems. I'm not ruling out the trigger as a problem, but it is strange that every step above 1/100th perfectly doubles the effect I am seeing. And upon further inspection even the 1/100th has striping. I cropped the images and left the exif intact, but I don't know if it will show up: 1/125 F 5.6 First Picture (portrait orientation, which is why is looks sideways) 1/250 F 5.6 Second Picture Images are cropped from original raws using viewer 2. Any thoughts or ideas on this one are welcome.