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The real question is would that add up to 28 days?
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Well I'm not so math challenged that I couldn't set it for 28 exposure at a 5 day interval. 5 might be too much or too little but I suppose it could be easily calculated by knowing the rate of sun movement each day for the time of year and the diameter of the light cast by the sun on the image/paper. Anyone up for figuring that out? I'm sure you wouldn't end up with 28 individual streaks since some of those days would likely be cloudy although less so as we move into spring.