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f/11

if the last calculation was eh ok, this second calculation also feel a bit inaccurate. D_tot= 7.01 cm, multipling by square root 2 gives 9.9 cm, so there should be 10 cm marks in focus. I see numbers 13 to 26cm to be in focus.

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Uploaded on April 23, 2020
Taken on April 22, 2020