Orion 9995 instruction manual B.Rotate the telescope 180 about the R.A.axis

8.Without moving the R.A. axis, adjust the azimuth control knobs (Figure 2) to orient Polaris in the center of the eye- piece field of view. Adjustment in Dec. axis using the hand controller may be necessary.

9.Loosen the R.A. lock knob and carefully rotate the tele- scope 180° about the R.A. axis (Figure 17a &17b) This should be done as accurately as possible referencing the R.A. mechanical setting circle.

a.

b.

Figure 17a-b.Rotate the telescope 180° about the R.A.axis.

10.Adjust the position of the telescope in the Dec. axis so Polaris lies on the R.A. crosshairs of the illuminated reticle eyepiece (Figure 16).

11.Carefully push the telescope in a horizontal motion while observing the movement of Polaris in the eyepiece field of view (Figure 18). This will determine which direction (left or right) moves Polaris closer to the center of the eyepiece field of view.

Figure 18. Gently push the telescope horizontally to determine direction of optical axis offset.

12.Carefully and gently loosen both the tube ring attachment screws (Figure 3) by a couple of turns.

13.Make adjustments to the optical axis offset adjustment screws (the socket head cap screws located at each cor- ner of the mounting plate, see Figure 3) according to the results of step 11. If Polaris moves toward the center when the telescope is pushed as indicated in Figure 18, loosen the adjustment screws near the front of the tube and tight- en the adjustment screws closer to the back of the tube (Figure 19a). If Polaris moves away from the center when the telescope is pushed as in Figure 18, loosen the adjust- ment screws near the back of the tube and tighten the adjustment screws closer to the front of the tube (Figure 19b). Look into the eyepiece. Adjust the adjustment screws just enough to place Polaris HALF the distance back to the center of the illuminated reticle eyepiece (Figure 20).

14.Repeat steps 7 to 12 until Polaris remains in the center of the eyepiece field of view, or moves slightly around the center, when the mount is rotated about the R.A. axis.

15. Retighten both the tube ring attachment screws.

Note: This calibration method can be applied to both refract- ing and reflecting telescope designs. Differences in the optical path of telescopes do not affect how the telescope tube and tube rings should be adjusted on the mounting plate.

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