![]() You can change the size of this aperture in the Instrument Setup menu - see step 10 above. Note: this black circle represents the size of the aperture through which the light passes to the diffraction grating and the detector. Next, adjust the eye piece of the View Finder until the black circle in the center of the image appears sharp against the background. First, adjust the lens so the image through the View Finder appears blurred.
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