Could you use them on a hard disk platter? Is there software out there for recovery of data from a set of platters taken from a bad HDD for which replacement heads / doner drives are not longer available?
Perhaps only a very early hard drive, as 15um is the resolution of those cameras but the latest hard drives have a track pitch around 100nm (0.1um); in any case, in the data recovery industry the usual solution is a spinstand:
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