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I expect prop' is right. In my work, I used my digital camera around very powerful electromagnets without ill effect. It uses an SD memory disk instead of magnetic recording media.
Some older cameras used floppy disks, and there may be justification for some pro cameras to use HDDs due to file sizes; but given the power requirements of either floppy or hard drives, most consumer cameras use memory cards instead these days. These could be susceptible to electromagnetic pulse effects or powerful radio waves in extreme cases, but ordinary magnetic fields ought not bother most digital cameras.
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John
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