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Jorge --
If you work on a light table be sure to mask the step tablet completely with black paper and turn out all the room lights. You won't be able to use the fogged film "filters" over the lens because they'll diffuse the image, but you can slip them under the step tablet. You should be able to calculate the exposure times from the densities of the "filters." If you can arrange for exposure times of 1/10th to 500 or more seconds, this should work!
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