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(a) Image of a filter wheel with known optical densities ranging from 1 – 4 converted to OD. The OD values of ND = 1 & 2 match the known filter values, however, the higher values, ND = 3 & 4 are not near their known values. (b) An image of the same filter wheel taken with a series of 3 images with increasing exposure times to create an accurate (within 4%), high dynamic range image. This represents an image accurately covering 80 dB of dynamic range.
