Remove lens, open back, hold up to light and look through at the shutter plane as you fire it. Start at 1/2000 and work down. If you're getting completely blank frames, then there will be times you fire it and you will see no light. If curtain speeds are off, it will be worst at 1/2000 as that's when the slit is the smallest and curtain speed errors will be more obvious. John


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