[John]

Just an idea, don't know if it will work. Use the lowest ISO available and the darkest ND filter you have. Open the shutter on 'bulb setting' with the lights off. When vibrations have subsided switch the lights on for the required length of time, then close the shutter. No use in daylight of course. In daylight the low ISO and ND filter might allow you to use a piece of black card in front of the lens to time the exposure. A bit tricky but it might work. In any case the longer shutter speed allowed by the low ISO and the ND filter might take it out of the danger zone 1/3 s to 1/30 s for a 50 mm lens.

PS

I have now tried the daylight method and the result is shown. 5s @ f22 ISO 100. I used a zoom lens (40 mm) without macro at a distance of 450 mm. I think it could be sharper with the right lens but looking round the edges of the stamp and at the background I can't see any camera shake. Can anyone else?