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Rotate the focus knob with your fingers until the object comes into sharp focus. Go a little bit beyond sharp focus until the image just starts to blur again, and then reverse the rotation of the knob, just to make sure you’ve hit the exact focus point. Using the Zoom Eyepiece The TrailHead zoom spotting scope line provides continuous zoom magnification of either 15-45x (on the 65mm) or 20x to 60x (on the 85mm). The magnification is adjusted by rotating the knurled rubber zoom ring on the eyepie