hi guys, tried my lee big stopper over the weekend and got some weird issues on my EM1. I had the camera on a Tripod, no IS, release by remote shutter cord etc. I focused with the ND on (it still focused and I got the Green AF confirmation), but after the long exposure NR finished, I reviewed the image and at 5x magnification it was very apparent that the image was very blurry. I put this down to false AF confirmation with the big stopper on, so removed it, focussed again, and then slid the lens (the 12-40 F2.8) back into manual making sure I didn't touch the focus ring. I then took a test photo with the ND off, and as suspected, it was razor sharp. then very carefully attached the ND into the holder (again without moving the lens) and look some more test shots, and again they were all blurry ? thinking it might be a faulty filter, I swapped the body for my Panasonic GX7, using the same Olympus lens and shot some more test shots and they were all razor sharp with / without the filter ? Any ideas what might be the problem with the EM1, or do they just not like very long exposures ?