Thanks, demp10 and Jason.
I saw that the manual says that increased noise could happen more at high ISO, so I did a quick, informal test at ISO 5000. I took shots first with no LV, then with LV, then 30 seconds of LV, then 1 minute, then 2 minutes. All of the same scene of course, with some deep shadow.
I couldn't tell any difference in noise betweeen any of them. My conclusion: it's nothing for me to worry about. Maybe it only happens when the sensor gets really hot, right before shutting down.
Greg
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