ESSLNB 700x70mm Astronomical Telescope

Introduction

The ESSLNB new astronomy telescope allows you to enjoy and explore both terrestrial and celestial objects in nature, providing a lot of fun. Our manufacturer guarantees it is a high-end product made with non-polluting and non-toxic substances, with materials certified as harmless to the human body. Please read this instruction manual carefully and completely, as it contains important information for achieving the best results from your telescope.

If you need assistance with assembling or operating your telescope, you may contact us by mail at any time. Embark on a wonderful journey to operate our telescope; we hope you will love it.

WARNING

TO AVOID ANY EYE INJURY, NEVER LOOK DIRECTLY INTO ANOTHER OPTICAL INSTRUMENT THROUGH THE TELESCOPE, AND NEVER OBSERVE THE SUN WITH UNPROTECTED EYES!

Telescope Parts

A diagram shows a blue astronomical telescope mounted on a silver tripod. The labeled parts are:

• A. Main body
• B. Objective lens
• C. Red dot finderscope
• D. Eyepiece
• E. 90° Erect diagonal prism
• F. Focusing Knob
• G. Aiming control & lock
• H. Screw
• I. Tripod leg
• J. Tray
• K. Leg locks

Instruction for Assembly

1. Extend the tripod legs to the desired length by opening the screw.

2. Gently pull the tripod apart and close the screw.

3. Attach the accessory tray (J) to the flanges of the tripod legs by rotating it until it fits into the groove according to the hole shape.

4. Place the astronomical body into the tripod head and turn the screw knob to fix it.

5. Move the battery's insulating piece away, and move the switch to 'on'.

6. Insert the finderscope into the bracket.

7. Loosen the thumbscrew and remove the cap.

8. Insert the diagonal lens into the focusing tube. Hold it in place by tightening down the mounting bolts.

9. Loosen the thumbscrew. Insert the eyepiece into the diagonal lens. Then tighten it.

10. If a Barlow lens is available, insert it between the eyepiece (or diagonal lens) and the focusing tube. It may provide a better effect between the eyepiece and focusing tube without the diagonal lens, depending on your needs.

Assembly is completed.

Telescope Use

1. Open the red dot finderscope.

2. Use the finderscope to find the target you want to see.

3. After finding the target, look into the eyepiece, turn the direction of the telescope to your target, then tighten the screw.

4. Look into the eyepiece of the telescope and roll the focusing knob to make the target clear.

5. Replace with a high-power eyepiece to magnify your target.

6. If there is a Barlow lens, insert it as shown in the instruction of assembly.

Altitude-Azimuth Mount

The telescope is fitted with an Altitude-Azimuth mount. "Altitude" refers to the telescope's up and down or vertical movement, while "Azimuth" refers to its sideways or horizontal movement. The Altitude-Azimuth mount, used in conjunction with the micro-adjustable Altitude control and Azimuth Lock, allows you to see the entire night sky or any celestial body without having to move the tripod.

Magnification – Selecting a Suitable Eyepiece

Magnification defines the telescope's ability to enlarge an image or bring it closer for better viewing.

EXAMPLE: 700mm focal length / Eyepiece K20 (20mm) = 35X

The required degree of magnification depends on the object being observed. For ideal viewing conditions, it is recommended that the magnification factor corresponds to no more than 15 to 20 times the lens diameter. For instance, the optimal magnification of 175X to 525X obtained with a 70mm diameter lens makes it possible to observe most celestial bodies. For observing stars, a lower magnification factor is recommended as it provides a wider field of view, making objects easier to locate. The highest magnification factor should be reserved for detailed observations of the moon, which is relatively close and bright, allowing for good detail resolution even at high magnification.

Barlow Lens

The Barlow lens increases the magnification factor provided by the telescope. A 3X Barlow lens triples the telescope's magnification power, potentially increasing a 35X magnification to 525X. The highest magnification factor Barlow lens should only be used for very bright, large objects such as the moon and the brightest planets, or during optimal nighttime observation conditions. Avoid using the Barlow lens and eyepiece extension in conjunction with the angle prism, as this combination can lead to low resolution and focusing difficulties. If using the Barlow lens with the focusing tube, fit the required eyepiece directly onto the Barlow lens, and then perform focusing as usual.

Tips

1. Always start viewing with your 20mm eyepiece, which is your low-power eyepiece. Its wide viewing field makes it easier to locate objects. You will notice that stars appear as points of light because they are so distant; even the largest telescopes show stars this way.

2. Once you have located an object and the view is clear, you may wish to change to a high-power eyepiece. The object will appear larger but not as bright as with the 20mm eyepiece, which is normal. If viewing conditions are poor, the high-power image may not appear sharp or stable. In such cases, switch back to the 20mm eyepiece and try the high-power eyepiece another night. You can also achieve higher power by inserting the 3X Barlow lens between the telescope and either eyepiece, which triples the available power.

Cleaning & Maintenance of Optics

Optical components of a telescope can accumulate dirt and dust over time. Any cleaning of lenses or mirrors should be done with the utmost care, ideally by experienced individuals. Significant dirt or dust must be present on the optical surface before it becomes visually noticeable.

1. Keeping the dust caps on during storage will reduce the amount of dust collected.

2. After using the telescope, dew condensation may form on the optical surfaces. When bringing the telescope indoors, remove the dust caps and allow moisture to evaporate naturally. Point the telescope downwards to minimize the collection of airborne dust.

3. Once the moisture has evaporated, replace the dust caps.

4. To remove dust from lenses or mirrors, first try using a can of filtered compressed air. Remove the dust cap and dew shield (for refractor telescopes) or take out the mirror cell (for reflecting types). Point the air can away from the optics and gently expel some air to remove any condensate in the can lines and clear off dust from the discharge tube. Then, using short, quick bursts of air, carefully remove dust particles. DO NOT HOLD THE TRIGGER OF THE COMPRESSED AIR FOR TOO LONG, AS CONDENSATE MIGHT BE BLOWN ONTO THE OPTICAL SURFACE. If particles remain after several attempts, it is advisable to have the telescope cleaned by a dealer.

The optics of your telescope should last a long time before requiring major cleaning. Avoid sudden temperature fluctuations that can cause air moisture to condense on the telescope's lens. By keeping the dust caps on and avoiding the temptation to handle the lenses or mirrors, you will find that very little optical maintenance is needed.