LUVONI F90090AZ 90mm Telescope Instruction Manual

F90090AZ 90mm Telescope
Instruction Manual

F90090AZ 90mm Telescope

Warning
Never use the LUVONI ® Telescope to look at the Sun I Looking at or near the Sun will cause instant and irreversible damage to your eye. Eye damage is often painless, so the observer is not warned that damage has occurred until it is too late.

1. Do not point the telescope at or near the Sun.
2. Do not look through the telescope or viewfinder as it is moving.
3. Children should always have adult supervision while observing.

The retractor uses a lens to bend or refract incoming light rays,  hence the name. And the LUOVIN refractors telescope includes achromatic (2-element) objective lens to reduce or virtually eliminate the false color (chromatic aberration). In the refracting telescope, light is collected by a 2-element objective lens and brought to a focus at F.

Check Your Telescope Before Assembling

1. Telescope Parts Diagram

2. Parts List

3. Telescope Tube

4. Tube Ring

5. Altazimuth Tripod

6. Finder scope

7. Diagonal Mirror

8. 25mm Eyepiece

9. 10mm Eyepiece

10. 6mm Eyepiece

11. Wireless Remote

12. Phone Adapter

13. 3X Barlow Lens

14. Accessory Tray

15. Wrench X2

16. Slow-motion Knobs X2

17. Screw 1

18. Screw 2

NOTICE: Before use, carefully inspect all parts to ensure all are present and nothing is missing or damaged. If you receive a used telescope or the telescope miss parts, please contact our service Email: LUVONI- Service@outlook.com and we will provide a free replacement.

Assembling Your Telescope

1. Tripod Set UpStep 1: Loosen the knobs at the bottom of each leg and extend the inner section of the leg to the desired length. Tighten the knobs to secure the legs, being careful not to over tighten. Then pull the legs outward until each leg is fully extended.STEP 2: Take the two screw out of the package and install Screw 1 and Screw 2 to the altazimuth arm.STEP 3: Insert the two slow-motion knobs into the slots to attach to your Altazimuth.STEP 4: Rotating and installing the accessory tray to the tripod.

2. Telescope Assembly STEP 1: Loosen the knob on the tube ring, remove the plastic bag over the telescope tube, and install the tube ring. STEP 2:
   1. Loosen Screw 1 and Screw 2 on the top of the Altazimuth Tripod.
   2. Embed the dovetail mounting bar into the recess on the top of the Altazimuth Tripod.
   3. Tighten Screw 1 and Screw 2 screw to hold the telescope tube in place.

3. Finderscope Assembly Slide the finder bracket (attached to the finder scope) into the mount bracket on the telescope.

4. Eyepiece Assembly

5. Loosen the screws on the end of the telescope tube.

6. Insert a diagonal mirror into the telescope tube and re-tighten the screws to hold the diagonal mirror in place.

7.  Loosen the screws on the diagonal mirror.

8.  Insert the desired eyepiece into the diagonal mirror and secure by re-tightening the screws.

Operating Your Telescope

1. Parts Function

Take the time to become acquainted with your refracting telescope and all of these controls. Before attempting observations through the telescope. Focus Knob: Moves the telescope’s focus drawtube in a finely-controlled motion to achieve precise image focus. Rotate the focus knob clockwise to focus on distant objects, and counter clockwise to focus on nearby objects. Diagonal Mirror: Holds the eyepiece upright for easy viewing and correctly orientates the image. Finder Scope: Provides an easier way to initially sight objects than the main telescope eyepiece which has a narrower field of view. (The scene is upside down). 3X Barlow Lens: Based on installing the eyepieces, it can be magnified by an additional 3X, and the overall can be magnified to 108X-450X. Telescope Tube: The main optical component that gathers the light from distant objects and brings this light to a focus for observation with the eyepiece. Altazimuth: By rotating and adjusting the control lever on the Altazimuth, the lens barrel can be moved freely in the horizontal and vertical directions, making it easier and more accurate to find the observation scene. Wireless Remote: It can control the mobile phone to take pictures from a long distance. Phone Adapter: Connect the mobile phone and the telescope, and display the objects you see through the mobile phone, which is more convenient. Slow-motion Knobs: Finely adjust the vertical (altitude) and horizontal (azimuth) axes. Adjustable Tripod: Its height can be adjusted from 33.86″ to 56.06″. Suitable for all kinds of people.
Spread the tripod legs out as far as they will open for a secure viewing platform. Accessory Tray: Conveniently holds extra eyepieces and other accessories.

Focusing the Telescope

1. Selecting an Eyepiece
   You should always start viewing with the lowest magnification eyepiece, which in this case is the 25 mm lens. So we have the widest field of view. A formula can be used to determine the power of each eyepiece: Telescope Focal Length divided by Eyepiece Focal Length= Magnification (e.g. Using the 25 mm lens, a sample calculation would look like this: 900mm / 25mm = 36X).

2. Finding a Target
   After selecting the desired eyepiece, aim main telescope tube at a land-based target at least 200 yards away (E.G. a telephone pole or building)

3. Rotating Focus Knob
   While looking through the selected eyepiece (in this case the 25 mm), slowly rotate focus knob until objects image becomes clear.

Aligning the Finder scope

Aligning the finder scope is an important step in using the telescope, When the finder scope and the telescope tube with the same target (Often, the position of objects in the finder scope is not the same as in the telescope tube.), objects can be quickly located and brought to the center of the field. Alignment is best done outdoors in daylight when it’s easier to locate objects.

1. Figure A. A distant object is centered in the telescope’s field of view. In this example, we have a house with a chimney. The chimney is the reference point to place at the center of the field of view.
2. Figure B. Looking through the finder scope we see the same building. But in this case, the chimney is not centered in the finder scope. We adjust the finder scope using the three thumbscrews so that the finder scope moves slightly. This is enough to correct the object’s position in the finder scope. Trial and error are required to get a satisfactory result. Make sure to tighten the 3 screws after finishing so that the finder scope tube does not move.
3. Figure C. After playing with the three finder scope thumbscrews and some trial and error we get the finder scope reticle close to the center (in this case the chimney). The Finder scope is now ready to use!

NOTE: If the finder scope image is upside down, this is normal. Because the finder scope is composed of convex lenses, according to the imaging principle of physical optics convex lenses, we can know that the image is upside down.

Operating the Altazimuth Tripod

Adjustable Altazimuth Arm
You may wish to change the angle of the mount arm to give you additional range of motion. If you want to point the scope well below the horizon or straight up at the zenith, you will need to change the angle of the mount arm to accommodate this.
By turning the Large knob on the AZ mount, the AZ mount arm can be adjusted to a 180° angle forward or backward. Slow-Motion Knobs
The slow-motion knobs attached to the vertical and horizontal axes allow precise aiming of the telescope on both the vertical (altitude) and horizontal (azimuth} axes. Finely adjust the angle without causing shaking during adjustment, and the positioning is more accurate. Adjust the Safety Screws
When the telescope is installed or used for some time, you can’t fix the telescope tube to the angle you need. It may be that the safety screw is loose. Please use a wrench (equipped) to tighten the safety screw.

Using the Barlow Lens

The Barlow lens is a negative lens that increases the magnifying power of an eyepiece while reducing the field of view. It expands the cone of the focused light before it reaches the focal point so that the telescope’s focal length appears longer to the eyepiece.The Barlow lens is usually between the diagonal mirror and the eyepiece in a retractor. In this position, it gives even greater magnification. For example, use the 25mm eyepiece, you can see the 36X image. Use the Barlow lens, you can see the 108X image. (Notice: Please pull out the bottom cover of the 3X barlow lens, do not rotate it.)

Using the Phone Adapter

Step1
Open the phone holder to install the phone on the phone holder Step2
Align the hole of the hand holder with the lens of the phone by adjusting knob A Step3
Fix the eyepiece on the phone holder by rotating B Tip: If you find it difficult to adjust the focus when using the phone holder please make sure you have adjusted the focus to obtain a clear image before using the phone holder
Step4
Install the eyepiece on the telescope and fix it with knob C and get a clear image

Calculating the Magnification {Power)

The magnification power of a telescope indicates how much an image is enlarged or how big and close it appears to the viewer, The focal length of the eyepiece combined with the focal length of the telescope, determines the magnification power. To calculate the power of your telescope with any particular eyepiece, simply divide the focal length of the telescope(900mm) by the focal length of the eyepiece(indicated in “mm” on the eyepiece collar). The 3X Barlow lens and interchangeable eyepieces provide the following magnification values (see Fig.4 ).

Observing the Sky

1. Sky Conditions
   Sky conditions are usually defined by two atmospheric characteristics, seeing, or the steadiness of the air, and transparency, light scattering due to the amount of water vapour and particulate material in the air. When you observe the Moon and the planets, and they appear as though water is running over them, you probably have bad “seeing” because you are observing through turbulent air. In conditions of good “seeing”, the stars appear steady, without twinkling, when you look at them with unassisted eyes (without a telescope). Ideal “transparency” is when the sky is inky black and the air is unpolluted.

2. Selecting an Observing Site
   Travel to the best site that is reasonably accessible. It should be away from city lights, and upwind from any source of air pollution. Always choose as high an elevation as possible; this will get you above some of the lights and pollution and will ensure that you aren’t in any ground fog. Sometimes low fog banks help to block light pollution if you get above them. Try to have a dark, unobstructed view of the horizon, especially the southern horizon if you are in the Northern Hemisphere and vice versa. However, remember that the darkest sky is usually at the “Zenith”, directly above your head. It is the shortest path through the atmosphere. Do not try to observe any object when the light path passes near any protrusion on the ground. Even extremely light winds can cause major air turbulence as they flow over the top of a building or wall. If you try to observe on any structure, or even a sidewalk, movements you make may cause the telescope to vibrate. Pavement and concrete can also radiate stored heat which will affect observing. Observing through a window is not recommended because the window glass will distort images considerably. And an open window can be even worse, because warmer indoor air will escape out the window, causing turbulence which also affects images. Astronomy is an outdoor activity.

3. Choosing the Best Time to Observe
   The best conditions will have still air, and obviously, a clear view of the sky. It is not necessary that the sky be cloud-free. Often broken cloud conditions provide excellent seeing. Do not view immediately after sunset. After the sun goes down, the Earth is still cooling, causing air turbulence. As the night goes on, not only will seeing improve, but air pollution and ground lights will often diminish. Some of the best observing time is often in the early morning hours. Objects are best observed as they cross the meridian, which is an imaginary line that runs through the Zenith, due North-South. This is the point at which objects reach their highest points in the sky. Observing at this time reduces bad atmospheric effects. When observing near the horizon, you look through lots of atmosphere, complete with turbulence, dust particles and increased light pollution.

4. Cooling the Telescope
   Telescopes require at least 10 to 30 minutes to cool down to outside air temperature. However this may take longer if there is a big difference between the temperature of the telescope and the outside air.
   This minimizes heat wave distortion inside telescope tube (tube currents). Allow a longer cooling time for larger optics. If you are using an equatorial mount, use this time for polar alignment.

5. Using Your Eyes
   Do not expose your eye to anything except red light for 30 minutes prior to observing. This allows your pupils to expand to their maximum diameter and biochemical light adaptation to occur. It is important to observe with both eyes open. This avoids fatigue at the eyepiece, allows you to check against reference material, and is a good habit to develop if you sketch at the eyepiece. If you find this too distracting, cover the nonused eye with your hand or an eyepatch. Use averted vision on faint objects: The center of your eye is the least sensitive to low light levels. When viewing a faint object, don’t look directly at it. Instead, look slightly to the side, and the object will appear brighter.

Care and Cleaning Tips

1. Keep the dust cap on during storage and transport to reduce dust.
2. The telescope should be stored in a dry, ventilated place with little dust to prevent mildew on the surface of the lens. Once mildew has been found, clean the telescope as soon as possible. Usually, the initial mildew can be completely removed.
3.  Avoid sudden temperature changes, as the moisture in the air will condense on the mirrors and eyepiece lenses. If condensation collects on the optical surfaces, remove the dust cap and allow the moisture to evaporate naturally. Put the telescope downward to minimize the accumulation of airborne dust.
4.  Once all moisture has evaporated, reinstall the dust cap and stored it in the package.
5.  Cover the telescope when not in use, few dust on the mirror does not have to be cleaned very often, once there is a thick layer of dust, it needs to be cleaned as soon as possible. NOTE: DO NOT blow the dust with your mouth.

Frequently Asked Questions

Q1: Why all I see is darkness?

Make sure that there is no lens cover at the front of the telescope. 1. If you can't see anything clearly through telescope at night, try using telescope during the day first. 2.Look into the eyepiece. When you look through the eyepiece, you should see a patch of white. Then, when you move your hand in front of the objective and wave it around, you should see the view dim/brighten/darker. 3.lf still dark after trying it, the objective lens may be damaged. Please contact us and we will send you a free replacement. CONTACT EMAi L: LUVON I-Service@outlook.com

02: Why are things upside down in the Finder Scope?

If the finderscope image is upside down, this is normal. Because the finderscope is composed of convex lenses, according to the imaging principle of physical optics convex lenses, we can know that the image is upside down.

03: Can I see planets with the telescope?

Under normal circumstances, you can see the craters on the moon, and the changes of the moon, Mercury, and Venus in different periods. In addition to the Moon, your telescope will be able to observe the 3 rightest planets. • Mars- When it is near opposition (the point in its orbit where it is closest to Earth) you should be able to discern the polar cap and possibly some larger surface features that appear as dark markings on the surface. • Jupiter- Look for the darker methane cloud bands that circle the planet just above and below the equator. If the Great Red Spot is facing the arth, you may be able to catch a glimpse of it. • Saturn- The rings! Saturn is arguably one of the most beautiful objects to look at in a telescope. If seeing conditions are stable enough, you may even catch the shadow of the rings on the planet and the shadow of the planet on the rings.

Q4: Why can't I see the object after adjustment?

1. Calm nights will offer the best views of the planets and moon. On windy days, the image of the moon and planets will appear to fluctuate or jump in the eyepiece. 2. When observing planets, observe in a place away from strong light. The bright lights of large cities can make it impossible to see faintly lit deep-sky objects. 3. The recommended observation time to observe the planets and moon is before dawn and night. 4. When observing non-celestial objects, the objects should not be too far away, and the light should not be too dark.

LUVONI AZ Telescope F90090AZ
EMAIL: LUVONI-Service@outlook.com
If you have any questions, please do not hesitate to contact us!

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