iOptron 70AZ instruction manual Star Observation, Focusing Telescope, Aligning Finderscope

Install and use this eyepiece the same way you do with the Barlow lens. You cannot use the Barlow lens when using this eyepiece.

2.1.5.Focusing Telescope

After selecting the desired eyepiece, aim the telescope tube at a land-based target at least 200 yards away (e.g. A telephone pole or a building). Fully extend focuser drawtube by turning the focusing knob. Always start with a low power eyepiece.

While looking through selected eyepiece, slowly retract focuser drawtube by turning focusing knob until object comes into focus.

2.1.6.Aligning Finderscope:

The extended field of view (FOV) offered by the 5x24 mm finderscope (#2) makes it easier to aim at an object before viewing it through the main telescope tube with a higher magnification.

1). Remove the front lens cover from the telescope (#1). Select a low power eyepiece (20mm). Look through telescope and establish a well-defined target (see focusing telescope section). Tighten all locking knobs so that telescope’s aim is not disturbed.

2). Looking through the finderscope, alternate tightening or loosing each finderscope adjustment screw (see Figure 14) until the crosshairs of the finderscope are precisely centered on the same object already centered in main telescope’s field of view.

Adjustment screw

Figure 14. Finderscope

3). Now, objects centered with the finderscope first will be shown in the FOV of the main telescope. They can be focused by turning the finderscope’s threaded eyepiece. The image in the finderscope will be reversed.

2.2. Star Observation

First of all you will need to choose an object that is easy to find. The Moon or a bright star is a good target to start with.

1.Slightly loose the telescope's altitude locking knob (#12) and the azimuth locking knob (#13). By applying slight pressure by hand, the telescope should now move freely along its two axes.

2.Move the telescope along altitude (vertical) and azimuth (horizontal) axes and using the aligned finderscope to find the Moon. With the object centered in the finderscope's cross hairs, retighten the altitude and azimuth knobs.

3.The Moon should be visible somewhere within the FOV of the main telescope. Focus the image by adjusting the focusing knob (#6). Center the Moon by adjusting the mount in altitude and azimuth directions.

4.You’ll find that the object immediately starts to shift across the FOV. This motion is due to the earth rotation. Lower-power eyepieces will reduce this effect of movement considerably and allow you to observe an object for a longer duration before you have to readjust your telescope. To "track" the object and keep it in the FOV, adjust the altitude using the Altitude slow motion rod and the azimuth by loosing the azimuth

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