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As I understand it when shooting with live view, one blind is open and the other closes to end the exposure. The non-instant nature of the movement of the blind, as well as its acceleration, results in less exposure at one side, and more at the other, producing the exposure problem shown in the picture. This is of concern to us from an astronomical perspective mostly when used for solar imaging in an ND3 filter; I can't think of much else that would be bright enough to result in these lengths of exposures, short of terrestrial daytime use.
Regards,
Eric
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