the locking screws to secure the mount. Loosen four Latitude Locking Screws on the side of the mount, turning the Latitude Adjustment Knob to adjust the latitude (altitude). Use the Lever for a fine latitude adjustment. Re-tighten the lock screws.

Initializing the polar scope

During initial setup of the iEQ mount, it is likely that the viewing hole on the DEC axis of the polar scope may be blocked by the DEC axle. The Polar Scope Dial in the polar scope should be set at the normal clock position with 12 o’clock located at the top, as shown in Figure 11. Before doing the Quick Polar Axis Alignment, complete the following steps:

(1)Take off both the Polar Axis Cover and the Polar Scope Cover from the mount.

(2)Thread the dark field illuminating LED end into the threaded hole and plug the other end into the Reticle socket located on the control box (Figure 12). The illumination intensity can be adjusted using the hand controller (HC) via the “Set Eyepiece Light” function under the “Set Up Controller” menu.

(3)Use the UP or DOWN button to turn the DEC axle if it blocks the Polar Scope view, press number buttons to change the slew speed.

(4)If the 12 o’clock of the Polar Scope dial is not at the top, as shown in Figure 11, rotate it using HC’s LEFT or RIGHT button.

Figure 12. Connect the illumination LED to Polar Scope

NOTE: Do not disassemble the Polar Scope to rotate it. It is adjusted at the factory and can be misaligned if you disassemble it. A good Polar alignment is the basis for good GOTO and tracking performance.

Quick polar axis alignment

(1)Turn on the mount power by pressing the On/Off switch on the R.A. unit. After “GPS OK” is shown in the upper right corner of the HC, the LCD will display the Polaris Position as shown in Figure 13 (a). If you are practicing inside or when there is no GPS signal, you can view this chart by pressing the MENU button, then select “Align” and “Polaris Position”. For example, on May 30, 2010, 20:00:00 in Boston, US (Lat N42º30’32” and Long W71º08’50”), 300 min behind UT, the Polaris Position is 1hr 26.8m and r= 41.5m, as shown in Figure 13 (a).

(2)Look through the polar scope; make sure the polar scope is not blocked by the DEC axle. The 12 o’clock indicator of the Polar Scope Dial must be positioned on top.

(3)Follow the Polar axis adjustment procedure (not the hand controller) to adjust the mount in altitude (latitude) and azimuth (heading) direction and place Polaris in the same position on the

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iOptron IEQ75-GTTM instruction manual Initializing the polar scope
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IEQ75-GTTM specifications

The iOptron IEQ75-GT is an advanced equatorial mount designed for amateur astronomers and astrophotographers seeking precision and reliability in their observations. This mount stands out due to its robust construction and innovative technology, making it ideal for a wide range of astronomical applications.

One of the main features of the IEQ75-GT is its impressive payload capacity. With the ability to support up to 75 pounds, it can easily accommodate a variety of telescopes and imaging setups, enabling users to explore both deep-sky objects and planetary details. The mount’s solid aluminum construction ensures stability, which is critical for long exposure astrophotography.

The IEQ75-GT is equipped with iOptron's signature GoTo system, allowing for easy navigation across the night sky. With its celestial database that includes over 200,000 objects, users can effortlessly locate and track their desired targets. The advanced GoTo technology also includes a built-in GPS, simplifying the alignment process and providing precise location data for better tracking.

Another notable feature is the mount's dual-axis tracking, which ensures that celestial objects remain in view, even during long exposure imaging sessions. The high-resolution encoders and closed-loop servo motors provide smooth movement and accurate tracking, reducing the risk of star trailing during exposures.

The mount is designed with portability in mind. Its compact size and lightweight construction make it easy to transport, making it a great choice for both backyard observations and remote dark-sky outings. The quick-release system allows for fast setup and teardown, enhancing convenience during stargazing sessions.

iOptron also incorporates unique smart technology in the IEQ75-GT. The mount is compatible with a range of mobile applications, allowing users to control the mount and access additional features directly from their phones or tablets. This level of integration enhances the observing experience and makes it easier to explore the night sky.

Additionally, the IEQ75-GT features a built-in autoguider interface, facilitating long-exposure astrophotography without the need for additional guiding equipment. The mount’s versatility and user-friendly design make it an excellent choice for both novice and experienced astronomers.

In summary, the iOptron IEQ75-GT combines high payload capacity, advanced GoTo technology, sturdy construction, and smart features to deliver a powerful astronomical platform. Whether you're passionate about stargazing or astrophotography, the IEQ75-GT is a worthy investment for any astronomy enthusiast, providing the reliability and precision needed for a successful observing experience.
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