They're wrong. As I said, both periscopes were 1.5x and 6x. Those were the only settings.
The British report on the captured U-570:
http://www.uboatarchive.net/U-570BritishReport.htm
Check pages 31 and 32.
And the American report:
http://www.uboatarchive.net/U-570ONIReport.htm
Pages 36 and 37.
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