If it isn’t, some collimation adjustment is needed. The hole should still be centered in the rings. Next, check the other side of focus by reversing direction of the focus knob so that the centered star is focused and then defocused again.If the hole is not centered, then adjustment to the collimation is needed (see Figure 3). If the telescope is collimated, the hole should appear centered relative to the rings. the shadow from the secondary obstruction) in the center (see Figure 2). There will be brighter rings of light surrounded by a dark hole (i.e. Defocus the telescope by about one turn of the focus knob until the star image appears doughnut shaped.Choose a star at least 20 degrees above the horizon to minimize the effect of atmospheric seeing conditions and slew the telescope to it.Allow 45 minutes for the telescope to reach equilibrium if you move it between large temperature extremes, like from a heated car or house into the cold night air. Before you begin, be sure that your telescope is in thermal equilibrium with its surroundings. Connect a higher power eyepiece (ideally, 10mm focal length or less). To begin, set up your telescope as you normally would for an observing session.To do this, you’ll need to examine a star image through the telescope’s eyepiece. We recommend taking a few moments to check collimation before each observing session. CHECKING COLLIMATION – HOW DO I KNOW IF MY OPTICS NEED ADJUSTMENT?Ĭhecking optical collimation is quick and easy.
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