Olympus USPM-RUIII Series - Page 26

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(8) Place the reference sample on the stage, and bring over the objective close to the
stage. While looking into eyepiece A, move the stage away gradually to a point
where the ring image (Image B) is focused into a pinhole image (Image A). When the
focus has been adjusted properly, the profile of a bright pinhole image will come into
sight clearly.
Image A
Image B