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I've been using 2 E-1's for 12 months, photographing school portraits (50,000 exposures) and while the results are generally good, I've experienced focusing problems with the 50mm lens. Some images are unsharp; show movement of the subject. I use studio flash all the time. The 14-54mmm lens is much better, however, some images are still unusable. Has anyone else experienced these problems?