Howdy @Marcus - The Raynox DCR-250 won't have any effect on the fastest shutter speed you can use. More than likely you had flash enabled. With the flash turned on, the fastest shutter speed you can use with the D3100 is 1/200. This is called the flash sync speed. To get faster shutter speeds with the Raynox DCR-250, just disable the flash. Happy shooting! :)
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