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«Instruction Manual Meade 90AZ-ADRB 90mm (3.5”) Altazimuth Refracting Telescope © 2007 (800) 626-3233 WARNING: NEVER USE A MEADE ...»

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Instruction Manual

Meade 90AZ-ADRB

90mm (3.5”) Altazimuth Refracting Telescope

© 2007

(800) 626-3233 www.meade.com











Every Meade telescope, spotting scope, and telescope accessory is warranted by Meade Instruments Corporation (“Meade”) to be free of defects in materials and workmanship for a period of ONE YEAR from the date of original purchase in the U.S.A. Meade will repair or replace a product, or part thereof, found by Meade to be defective, provided the defective part is returned to Meade, freight-prepaid, with proof of purchase. This warranty applies to the original purchaser only and is non-transferable. Meade products purchased outside North America are not included in this warranty, but are covered under separate warranties issued by Meade international distributors.

RGA Number Required: Prior to the return of any product or part, a Return Goods Authorization (RGA) number must be obtained from Meade by writing, or by calling (800) 626-3233. Each returned part or product must include a written statement detailing the nature of the claimed defect, as well as the owner’s name, address, and phone number.

This warranty is not valid in cases where the product has been abused or mishandled, where unauthorized repairs have been attempted or performed, or where depreciation of the product is due to normal wear-and-tear. Meade specifically disclaims special, indirect, or consequential damages or lost profit which may result from a breach of this warranty. Any implied warranties which cannot be disclaimed are hereby limited to a term of one year from the date of original retail purchase.

This warranty gives you specific rights. You may have other rights which vary from state to state.

Meade reserves the right to change product specifications or to discontinue products without notice.

This warranty supersedes all previous Meade product warranties.


Introduction.....................................................5 Standard Equipment..............................................5 Unpacking and Assembly..........................................5 Altazimuth Mount Mo

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• Complete optical tube assembly (objective lens diameter = 90mm; focal length = 900mm)

• Full-length, fully adjustable, aluminum tripod and accessory tray.

• MA25mm (36X), MA9mm eyepieces (100X), 1.25" O.D. “Outside Diameter”

• Diagonal mirror (1.25" O.D.)

• Red dot viewfinder

• Altazimuth mount

• Hardware package with bolts, wingnuts, nuts, etc. necessary for assembly

• Astronomy software (separate instructions supplied in software package) and instructional DVD ASSEMBLY You will need a Phillips-head screwdriver to assemble the tripod.

1. Remove and identify the telescope’s components, using the listing above.

2. Attach the 3 aluminum tripod legs (7, Fig. 1) to the base of the altazimuth mount (25, Fig. 1) with the 3 leg brace supports (8, Fig. 1) facing inward. Line up the holes of the tripod legs with the holes on the mount base attachment (27, Fig. 1) and thread the three included bolts through the holes.

Thread the wing nuts over the bolts and hand-tighten to a firm feel. Stand the telescope upright and spread the tripod legs evenly apart so that the accessory tray can be positioned for attachment to the leg braces.

3. The tray helps stabilize the tripod and is also a convenient holder of eyepieces and other Meade accessories, such as the Barlow lens. Line up the holes at the end of one of the leg brace supports (9, Fig. 1) with the holes in one of the leg braces (8, Fig. 1). Thread one of the one-half inch bolts through the holes. Thread a hex nut over the end of the bolt. Finger tighten the bolt and hex nut.

See Fig. 2. Repeat with the two other leg braces.

4. Thread the accessory tray (26, Fig. 1) over the center Finger tighten the mounting bolt and tighten to a firm feel.

hex nut

5. Extend the sliding center portion of the adjustable height tripod leg (19, Fig. 1) to the desired length for all 3 legs. Lock the tripod legs by tightening the leg lock thumbscrew (20, Fig. 1) to a firm feel. See Inset A.

Fig. 2

6. If the cradle ring assembly (5, Fig. 1) did not come attached to the optical tube (4, Fig. 1), loosen the cradle ring lock knob (6, Fig. 1) and open the cradle rings. Place the optical tube roughly in the center of the cradle rings and close the rings over the tube. Tighten the cradle ring lock knobs to a firm feel. Do not overtighten—note that you may wish to change the position of the tube to gain a more comfortable observing position of the eyepiece assembly.

7. Position the cradle ring’s mounting plate into the saddle plate slot (18, Fig. 1). Tighten the mounting lock knob (12, Fig. 1) to a firm feel.

8. Attach the red dot viewfinder bracket (24, Fig. 1) to the telescope using the 2 supplied thumbscrews. The thumbscrews thread over the 2 bolts located on the main tube.

11. Insert the diagonal mirror (13, Fig. 1) into the focuser drawtube (15, Fig. 1) and the MA 25mm eyepiece (1, Fig. 1) into the diagonal mirror. Tighten the respective thumbscrews to a firm feel.

12. The telescope is now completely assembled. To move the telescope and point it from one object another, first slightly loosen the vertical lock, then loosen the horizontal lock (11, Fig. 1).

Loosening these locks allows the telescope to be moved freely (vertically or horizontally) in any direction so that the telescope can be positioned to center a terrestrial or celestial object in the telescopic field. Once an object is found, the vertical lock knob (10, Fig. 1) can be tightened and the vertical slow-motion fine-adjustment control knob (16, Fig. 1) can then be used to make very smooth and accurate tracking in the vertical axis.

Looking at or near the Sun will cause irreversable damage to your eye. Do not point this telescope at or near the Sun. Do not look through the telescope as it is moving. –5–


It is recommended that you perform steps 1 through 5 of this procedure during the daytime and step 6 at night.

1. Loosen the horizontal and vertical locks of your telescope, so that the telescope can move freely.

2. If you have not already done so, place a low-power (e.g., 25mm or 26mm) eyepiece in the eyepiece holder or diagonal prism of your telescope. Point the telescope at an easy-to-sight land object (e.g., the top of a telephone pole or sign). Turn the focuser knob to focus sharply the image in the eyepiece. Precisely center the object in the eyepiece.

3. Re-tighten the horizontal and vertical locks so that the telescope does not move during the rest of the procedure.

4. Slide the intensity slider (28, Fig. 1) to the right to turn the red dot viewfinder On.

5. Looking through the viewfinder. Turn the viewfinder’s two alignment screws (3, Fig. 1) until the viewfinder’s red dot points precisely at the same object centered in the eyepiece. The red dot viewfinder is now aligned to the main telescope.

6. Check this alignment on a celestial object, such as the Moon or a bright star, and make any necessary refinements.

Using the Red Dot Viewfinder

1. Slide the intensity switch one position to the right to turn on the red dot viewfinder.

2. Look through red dot viewfinder; you will see a red dot projected at one end.

3. Slide the intensity switch one more position to the right. Note that the red dot has increased in intensity. Set the intensity switch to a position that is comfortable for your eyesight and the darkness of your observing site.

4. Slide the intensity switch all the way to the left to turn off the red dot viewfinder. Remember to turn the device off at the end of your viewing session.


Observe during the daytime: Try out your telescope during the daytime at first. It is easier to learn how it operates and how to observe when it is light.

Pick out an easy object to observe: A distant mountain, a large tree, a lighthouse or skyscraper make excellent targets. Point the optical tube so it lines up with your object.

Unlock the lock knobs: To move the telescope, you will need to unlock the horizontal (12, Fig. 1) and vertical (11, Fig. 1) lock knobs (just rotate to unlock or lock; when locking, only tighten to a “firm feel,” do not overtighten).

Use the red dot viewfinder: If you have not done so, align the red dot viewfinder (2, Fig. 1) with the telescope’s eyepiece (1, Fig. 1) as described earlier.

Look through the red dot viewfinder until you can see the object. It will be easier to locate an object using the viewfinder rather than locating with the eyepiece. Line up the object with the viewfinder’s red dot.

Look through the eyepiece: Once you have the object lined up in the red dot viewfinder, look through the optical tube’s eyepiece. If you have aligned your viewfinder, you will you see the object in your eyepiece.

Focus: Look through the eyepiece and practice focusing on the object you have chosen.

Observe the Moon: When you feel comfortable with the viewfinder, the eyepieces, the locks and the adjustment controls, you will be ready to try out the telescope at night. The Moon is the best object to observe the first time you go out at night. Pick a night when the Moon is a crescent. No shadows are seen during a full Moon, making it appear flat and uninteresting.

Looking at or near the Sun will cause irreversable damage to your eye. Do not point this telescope at or near the Sun. Do not look through the telescope as it is moving. –6– Look for different features on the Moon. The most obvious features are craters. In fact you can see craters within craters. Some craters have bright lines about them. These are called rays and are the result of material thrown out of the crater when it was struck by a colliding object. The dark areas on the Moon are called maria and are composed of lava from the period when the Moon still had volcanic activity. You can also see mountain ranges and fault lines on the Moon.

Use a neutral density filter (often called a “moon filter”) when observing the Moon. Neutral density filters are available from Meade as an optional accessory and enhance contrast to improve your observation of lunar features.

Spend several nights observing the Moon. Some nights, the Moon is so bright that it makes other objects in the sky difficult to see. These are nights that are excellent for lunar observation.

Observe the Solar System: After observing the Moon, you are ready to step up to the next level of observation, the planets. There are four planets that you can easily observe in your telescope: Venus, Mars, Jupiter and Saturn.

Nine planets (maybe more!) travel in a fairly circular pattern around our Sun. Any system of planets orbiting one or more stars is called a solar system. Our Sun, by the way, is a single, yellow dwarf star.

It is average as far as stars go and is a middle aged star.

Beyond the planets are clouds of comets, icy planetoids and other debris left over from the birth of our sun. Recently astronomers have found large objects in this area and they may increase the number of planets in our solar system.

The four planets closest to the Sun are rocky and are called the inner planets. Mercury, Venus, Earth and Mars comprise the inner planets. Venus and Mars can be easily seen in your telescope.

Venus is seen before dawn or after sunset, because it is close to the Sun. You can observe Venus going through crescent phases. But you cannot see any surface detail on Venus because it has a very thick atmosphere of gas.

When Mars is close to the Earth, you can see some details on Mars, and sometimes even Mars’ polar caps. But quite often, Mars is further away and just appears as a red dot with some dark lines crisscrossing it.

Jupiter, Saturn, Uranus, Neptune and Pluto comprise the outer planets. These planets, except for Pluto, are made mostly of gases and are sometimes called gas giants. If they had grown much bigger, they may have become stars. Pluto is made mostly of ice.

Jupiter is quite interesting to observe. You can see bands across the face of Jupiter. The more time you spend observing these bands, the more detail you will be able to see.

One of the most fascinating sights of Jupiter are its moons. The four largest moons are called the Galilean moons, after the astronomer Galileo, who observed them for the first time. If you’ve never watched the Galilean moons in your telescope before, you’re missing a real treat! Each night, the moons appear in different positions around the Jovian sky. This is sometimes called the Galilean dance. On any given night, you might be able to see the shadow of a moon on the face of Jupiter, see one moon eclipse another or even see a moon emerge from behind Jupiter’s giant disk. Drawing the positions of the moons each night is an excellent exercise for novice astronomers.

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