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My pleasure Warren. Full frame is in reference to the size of the sensor in the camera. A full frame digital camera has a sensor equivalent to the old 35mm film size. The Nikon D200 isn't a full frame camera and is what is known as a crop sensor. My figures were based on a Canon crop sensor which is the focal length multiplied by 1.6. Nikons crop sensors are slightly different and it is multiply by 1.5. So now that I know that your 50mm is actually 75mm. 600/75= 8 seconds absolute maximum.
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