Thanks for telling me that, actually, it is mostly luck. Confirming the
focusing position mark is difficult. I made a few test and average them.
C.H.Ling
----- Original Message -----
From: "Chuck Norcutt" <chucknorcutt@xxxxxxxxxxxxxxxx>
>
> ps: The thin lens equation predicts 0.254mm extension between 10 and 5
> meters so your measurement is pretty good.
>
> Chuck Norcutt
>
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