Has anyone experienced this purple bar issue? This is not the uniform banding seen on the E-M5. I was doing some night sky test shots with the E-M1 with the 25mm f1.8 and noticed a very distinct purple bar along the top edge of the exposure. I did some experimenting and found that it seems to appear between 1" and 0.5" shutter speed and between ISO 640 to 1600, all at f1.8. I didn't do a comprehensive aperture bracket but still noticed it up to f2.2. While the exposure indicator was not flashing I suppose this range could be considered under exposed for a night sky with average light pollution. I also tested with the 45mm f1.8 and got the same results so the rules out a lens issue. At ISO 2000 and above, for the same speed and apperture, the band disappears. I gong back through my images with the same exposure for the last year I came across another night sky image with the same issue so it's not new. My concern is, could this be a curtain or some mechanical issue? I've attached an image to illustrate the issue. If it's just exposure and others experience this then I can just make sure I don't shoot at this exposure. I have contacted Olympus support but I thought I'd pass it by the community as well.