INTRODUCTION

Congratulations on your purchase and welcome to the Celestron world of astronomy. If you’re a newcomer to the hobby of astronomy, some of the terms and telescope components described in this instruction manual may be new to you. This manual is designed to instruct you in the proper use of your Celestron C80- HD Refractor, C102-HD Refractor, C114-HD 4.5 Newtonian or C150-HD Newtonian as well as the CG-4 Equatorial Mount. To assist you in assembling and operating your telescope, take time to review this manual and the parts diagram listed in Figure 1.

WARNING—NEVER LOOK AT THE SUN WITH YOUR TELESCOPE OR ITS FINDERSCOPE. PERMANENT AND IRREVERSIBLE EYE DAMAGE MAY RESULT AS WELL AS DAMAGE TO YOUR TELESCOPE.

HOWEVER, YOU MAY ENJOY LOOKING AT THE SUN IF YOU HAVE A SAFE METHOD OF DOING SO—A SOLAR FILTER. IF USING THE SOLAR FILTER, MAKE SURE THE FINDERSCOPE IS COVERED.

TELESCOPE ASSEMBLY

The telescopes and all items are packed in one box. Included are:

•Telescope Optical Tube

•German Equatorial Mount

•Adjustable Aluminum Tripod

•6x30 Finderscope and Bracket

•Counterweight Shaft and Counterweights (3.6 Kg and 1.8 Kg for reflector models #31027, #31056 and refractor model #21016; 3.6 kg only for refractor model #21077 and CG-4 Eq Mount #91510)

•Tripod Accessory Tray

•Declination Slow Motion Knob

•Right Ascension Slow Motion Knob

•20mm Plossl Eyepiece

•1 ¼" Mirror Diagonal (Except #31027 & #31056)

Setting Up the Tripod:

1.Locate the tripod head (see figure 1). Attach each leg one by one to the tripod head by aligning the holes at the top of each leg with the holes in the tripod head. Slide a bolt through each of the legs and the tripod head and secure at the other end with a wing nut. NOTE: this may have been pre-assembled at the factory.

2.Now that the tripod legs are attached, stand the tripod up and spread the legs until the center leg support is fully extended.

3.The equatorial mount, which holds the telescope, attaches to the tripod head. On one side of the tripod head there is an “N” which signifies North. This side of the tripod will face north when setting up for an astronomical observing session. Above the “N” is a metal peg about 3/4" high that points straight up. Place the equatorial mount head on top of the tripod head so that the metal peg fits between the two

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Celestron 91510 instruction manual Introduction, Setting Up the Tripod
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91510 specifications

The Celestron 91510 is a remarkable telescope that offers astronomy enthusiasts a blend of quality, portability, and advanced features, making it a popular choice for both beginners and seasoned stargazers alike. Known for its impressive optics, the Celestron 91510 utilizes a 70mm refractor design that provides bright and clear images, ideal for observing celestial objects such as planets, stars, and deep-sky phenomena.

One of the standout features of the Celestron 91510 is its fully coated optics, which enhance light transmission and improve image quality. This ensures that users can observe fine details in celestial bodies, such as the rings of Saturn or the craters on the Moon. The telescope comes with two eyepieces of different focal lengths, allowing for varying magnification. This versatility enables users to explore the night sky with ease, offering both wide-field views of star clusters and higher magnification for detailed observations.

Portability is another significant advantage of the Celestron 91510. Designed with travel in mind, this telescope is lightweight and compact, making it easy to set up and transport. It features a sturdy yet portable mount that provides stable support during observations. The pan-and-tilt head allows for smooth tracking of celestial objects, ensuring that users can focus on their targets without hassle.

Moreover, the telescope includes a red dot finder which aids in locating objects quickly in the night sky. This user-friendly feature is especially beneficial for beginners who may find it challenging to navigate the stars. The adjustable tripod provides a stable base and can be set to various heights, ensuring comfort during extended viewing sessions.

Celestron's commitment to quality and innovation is evident in the design of the 91510. It incorporates durable materials that withstand the rigors of outdoor use, ensuring longevity. Additionally, the telescope's overall aesthetic appeal, complete with a sleek design, adds to the enjoyment of using this astronomical instrument.

In summary, the Celestron 91510 is an excellent choice for anyone looking to delve into the wonders of astronomy. With its high-quality optics, user-friendly features, and portability, it offers an enjoyable stargazing experience. Whether you are a novice wanting to explore the cosmos or an experienced astronomer seeking a reliable companion, the Celestron 91510 stands out as an exceptional option.
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