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Removing 100hz pulsing from mains lighting
The background is that I've been trying out a Canon Powershot digital
camera on a tripod with the Canon Zoombrowser software that lets the camera be controlled from a computer via the USB. This works well but illuminating the subject (a ragbag of documents and old pictures) with desk lights using ordinary GLS lights gives a visible pulsing of light which can be seen in the monitor due to the 50Hz mains frequency. [which means 2 flashes per sec or 100Hz] This isn't ideal as it clashes with typical camera exposure speeds. SFAIUI professional copystand lighting is expensive, so looking for a method of obtaining a smoothed light. One possibility would be DC lighting, but it needs to be quiite bright. Another possibility might be flourescent lighting - but does phosphor coating on the tube provides some lighting persistance? Any views on feasibility of either (& how to achieve it) or any other suggestions would be most appreciated. TIA |
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