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Author Message   Wonloo Tinkerer Username: Wonloo Post Number: 31 Registered: 07-2010 Rating: N/A Votes: 0 Posted on Saturday, April 16, 2011 - 03:31 pm:    The speed adjustment screw has a small movement but the difference is significance. The main difference is between speed ranges. If not properly adjusted, 1/15 may be close to or even faster than 1/30. Sorry, cannot help further without having the shutter on hand.