Celestron AstroMaster 114AZ Bedienungsanleitung

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Table of Contents

INTRODUCTION ..........................................................................................................................3

ASSEMBLY...................................................................................................................................6

Setting up the Tripod ..................................................................................................................6

Moving the Telescope Manually ................................................................................................7

Attaching the Telescope Tube to the Mount...............................................................................7

Installing the Diagonal & Eyepieces ( refractor)........................................................................8

Installing the Eyepieces on the Newtonians ...............................................................................8

TELESCOPE BASICS ...................................................................................................................9

Image Orientation .....................................................................................................................10

Focusing....................................................................................................................................10

Aligning the Finderscope..........................................................................................................10

Calculating Magnification ........................................................................................................11

Determining Field of View.......................................................................................................12

General Observing Hints...........................................................................................................12

ASTRONOMY BASICS..............................................................................................................13

The Celestial Coordinate System..............................................................................................13

Motion of the Stars....................................................................................................................14

CELESTIAL OBSERVING .........................................................................................................15

Observing the Moon .................................................................................................................15

Observing the Planets ...............................................................................................................15

Observing the Sun.....................................................................................................................15

Observing Deep Sky Objects....................................................................................................16

Seeing Conditions.....................................................................................................................18

ASTROPHOTOGRAPHY............................................................................................................19

Short Exposure Prime Focus Photography...............................................................................19

Piggyback Photography............................................................................................................19

Planetary & Lunar Photography with Special Imagers.............................................................19

CCD Imaging for Deep Sky Objects ........................................................................................19

Terrestrial Photography ............................................................................................................19

TELESCOPE MAINTENANCE..................................................................................................20

Care and Cleaning of the Optics...............................................................................................20

Collimation of a Newtonian......................................................................................................20

OPTIONAL ACCESSORIES .....................................................................................................23

AstroMaster Specifications...........................................................................................................24

Congratulations on your purchase of an AstroMaster Series telescope. The AstroMaster Series of telescopes come

in several different models and this manual covers three models mounted on the Alt-AZ Mount ((an altazimuth is

the simplest type of mount with two motions – altitude (up & down) and azimuth (side-to-side)))-- 70mm refractor,

90mm refractor, and 114mm Newtonian. The AstroMaster Series is made of the highest quality materials to ensure

stability and durability. All this adds up to a telescope that gives you a lifetime of pleasure with a minimal amount

of maintenance.

These telescopes were designed for the First Time Buyer offering exceptional value. The AstroMaster series

features a compact and portable design with ample optical performance to excite any newcomer to the world of

amateur astronomy. In addition, your AstroMaster telescope is ideal for terrestrial observations which will open

your eyes with superb high power viewing.

AstroMaster telescopes carry a two year limited warranty. For details see our website at www.celestron.com

Some of the many standard features of the AstroMaster include:

•All coated glass optical elements for clear, crisp images.

•Smooth functioning, rigid alt-azimuth mount with a large pan handle with built-in clutch for easy targeting.

•Preassembled steel leg tripod with 1.25” legs ensures stable platform.

•Quick and easy no-tool set up.

•CD-ROM “The Sky” Level 1 --- astronomy software which provides education about the sky and printable sky

maps.

•All models can be used terrestrially as well as astronomically with the standard accessories included.

Take time to read through this manual before embarking on your journey through the Universe. It may take a few

observing sessions to become familiar with your telescope, so you should keep this manual handy until you have

fully mastered your telescope’s operation. The manual gives detailed information regarding each step as well as

needed reference material and helpful hints guaranteed to make your observing experience as simple and pleasurable

as possible.

Your telescope is designed to give you years of fun and rewarding observations. However, there are a few things to

consider before using your telescope that will ensure your safety and protect your equipment.

Warning

•Never look directly at the sun with the naked eye or with a telescope (unless you have the proper

solar filter). Permanent and irreversible eye damage may result.

•Never use your telescope to project an image of the sun onto any surface. Internal heat build-up can

damage the telescope and any accessories attached to it.

•Never use an eyepiece solar filter or a Herschel wedge. Internal heat build-up inside the telescope can

cause these devices to crack or break, allowing unfiltered sunlight to pass through to the eye.

•Do not leave the telescope unsupervised, either when children are present or adults who may not be

familiar with the correct operating procedures of your telescope.

1 2

Figure 1-1 AstroMaster 90AZ Refractor

(AstroMaster 70AZ refractor similar)

1. Objective Lens 7. Pan Handle

2. Telescope Optical Tube 8. Accessory Tray

3. Star Pointer Finderscope 9. Tripod

4. Eyepiece 10. Azimuth Lock

5. Diagonal 11. Alt-Az Mount

6. Focus Knob 12. Dovetail Mounting Bracket

Figure 1-2 AstroMaster 114 AZ Newtonian

1. Star Pointer Finderscope 7. Azimuth Lock

2. Eyepiece 8. Accessory Tray

3. Tube Ring 9. Tripod

4. Telescope Optical Tube 10. Alt-Az Mount

5. Primary Mirror 11. Dovetail Mounting Bracket

6. Pan Handle 12. Focus Knob

This section covers the assembly instructions for your AstroMaster telescope. Your telescope should be set up

indoor the first time so that it is easy to identify the various parts and familiarize yourself with the correct assembly

procedure before attempting it outdoor.

Each AstroMaster comes in one box. The pieces in the box are – optical tube with attached sky pointer and tube

rings (114 AZ only), Alt-Az mount with attached pan handle, 10mm eyepiece – 1.25”, 20mm eyepiece – 1.25”

(erect image for 114AZ), erect image diagonal 1.25” (for 70AZ and 90 AZ), “The Sky” Level 1 CD-ROM.

igure 2- 7

1. Remove the tripod from the box (Figure 2-1). The tripod comes preassembled so that the set up is very

easy.

2. Stand the tripod upright and pull the tripod legs apart until each leg is fully extended and then push down

slightly on the tripod leg brace (Figure 2-2). The very top of the tripod is called the tripod head.

3. Next, we will install the tripod accessory tray (Figure 2-3) onto the tripod leg brace (center of Figure 2-2).

4. Insert the cut-out in the center of the tray (flat side of the tray facing down) to match the center of the

tripod leg brace and push down slightly (Figure 2-4). The ears of the tray should appear as in Figure 2-4

Figure 2-1 Figure 2-2 Figure 2-3 Figure 2-4

5. Rotate the tray until the ears are under the leg brace support of each leg and push slightly and they will lock

in place (Figure 2-5). The tripod is now completely assembled (Figure 2-6).

6. You can extend the tripod legs to the height you desire. At the lowest level the height is 24” (61cm) and

extends to 41” (104cm). You unlock the tripod leg lock knob at the bottom of each leg (Figure 2-7) and

pull the legs out to the height you want & then lock the knob securely. A fully extended the tripod looks

like the image in Figure 2-8.

7. The tripod will be the most rigid and stable at the lowest height.

Figure 2-5 Figure 2-6 F Figure 2-8

Mov

ovi

he AstroMaster Alt-Az mount is easy to move wherever you want to point it. The up and down (altitude) is

e controls

controlled by the pan handle (Figure 2-10). The side-to-side (azimuth) is controlled by the azimuth lock

(Figure 2-9). The pan handle and the azimuth lock are both loosened by turning the handle and lock

counterclockwise. When loose you can find your objects easily and then lock the controls. To lock th

in place, turn them clockwise.

Figure 2-10

Figure 2-9

r mounting bracket at the top of the mount

igure 2-11). For the 114 AZ Newtonian, the mounting bar is the bracket which is attached to the tube rings. For

. You will have to remove the tube rings on the 114EQ

ewtonian before removing the paper.

m – see Figure 2-18.

m to hold the telescope in place. cket.

nobs.

igure racket.

Shown is the 90AZ telescope tube

he telescope optical tube attaches to the mount via a dovetail slide baT

the 70AZ and 90AZ refractors the mounting bar is attached along the bottom of the telescope tube. Before you

attach the optical tube, make sure that the pan handle and azimuth lock are fully locked. Then put the

dovetail bracket in the horizontal position as shown in Figure 2-10. This will ensure that the mount does not move

suddenly while attaching the telescope optical tube. Also, remove the objective lens cap (refractor) or the front

opening cap (Newtonian). To mount the telescope tube:

1 Remove the protective paper covering the optical tube

2 Loosen the mounting knob and the mounting safety screw on the side of the dovetail mounting platform so they

do not protrude into the mounting platfor

3. Slide the dovetail mounting bar into the recess on the top of the mounting platform (figure 2-17).

5 Tighten the mounting knob on the dovetail mounting platfor

6 Hand tighten the mounting platform safety screw until the tip touches the side of the mounting bra

NOTE: Never loosen any of the knobs on the telescope tube or mount other than the R.A. and DEC k

Figure 2-11 F 2-12 Mounting Knob & Safety Screw in the dovetail b

Installing the Diagonal & Eyepieces ( refractor)

Installing the Diagonal & Eyepieces ( refractor

)

he diagonal is a prism that diverts the light at a right angle to the light path of the ou

eyepiece adapter of the the

2. to the diagonal and tighten

3. rsing the procedure Figure 2-13

refractor. This allows you to observe in a position that is more comfortable than if y

looked straight through. This diagonal is an erect image model that corrects the image

to be right side up and oriented correctly left-to-right which is much easier to use for

terrestrial observing. Also, the diagonal can be rotated to any position which is most

favorable for you. To install the diagonal and eyepieces:

1. Insert the small barrel of the diagonal into the 1.25”

focus tube on the refractor – Figure 2-13. Make sure the two thumbscrews on

eyepiece adapter do not protrude into the focuser tube before installation and the

plug up cap is removed from the eyepiece adapter.

Put the chrome barrel end of one of the eyepieces in

the thumb screw. Again, when doing this make sure the thumb screw is not

protruding into the diagonal before inserting the eyepiece.

The eyepieces can be changed to other focal lengths by reve

in step 2 above.

Ins

nst

he eyepiece (or ocular) is an optical element that magnifies the image focused by

when

1. Make sure the thumbscrews are not protruding into the focuser tube. Then,

2. epiece is called an erecting eyepiece since it corrects the

Figure 2-14

the telescope. Without the eyepiece it would be impossible to use the telescope

visually. Eyepieces are commonly referred to by focal length and barrel diameter

The longer focal length (i.e., the larger the number) the lower the eyepiece

magnification (i.e., power). Generally, you will use low-to-moderate power

viewing. For more information on how to determine power, see the section on

“Calculating Magnification”. The eyepiece fits directly into the focuser of the

Newtonians. To attach the eyepieces:

insert the chrome barrel of the eyepieces into the focus tube (remove the

plug up cap of the focuser first) and tighten the thumbscrews – see

Figure 2-14.

The 20mm ey

image so it is right side up and corrected left to right. This makes the

telescope useful for terrestrial viewing.

The eyepieces can be changed by reversing the procedure as described above.

A telescope is an instrument that collects and focuses light. The nature of the optical design determines how the light is focused.

Some telescopes, known as refractors, use lenses, .and other telescopes, known as reflectors (Newtonians), use mirrors.

Developed in the early 1600s, the refractor is the oldest telescope design. It derives its name from the method it uses to focus

incoming light rays. The refractor uses a lens to bend or refract incoming light rays, hence the name (see Figure 3-1). Early

designs used single element lenses. However, the single lens acts like a prism and breaks light down into the colors of the

rainbow, a phenomenon known as chromatic aberration. To get around this problem, a two-element lens, known as an achromat,

was introduced. Each element has a different index of refraction allowing two different wavelengths of light to be focused at the

same point. Most two-element lenses, usually made of crown and flint glasses, are corrected for red and green light. Blue light

may still be focused at a slightly different point.

Figure 3-1

A Newtonian reflector uses a single concave mirror as its primary. Light enters the tube traveling to the mirror at the back end.

There light is bent forward in the tube to a single point, its focal point. Since putting your head in front of the telescope to look at

the image with an eyepiece would keep the reflector from working, a flat mirror called a diagonal intercepts the light and points

it out the side of the tube at right angles to the tube. The eyepiece is placed there for easy viewing.

Newtonian Reflector telescopes

replace heavy lenses with

mirrors to collect and focus the

light, providing much more

light-gathering power for the

money spent. Because the light

path is intercepted and reflected

out to the side, you can have

focal lengths up to 1000mm and

still enjoy a telescope that is

relatively compact and portable.

A Newtonian Reflector

telescope offers such impressive

light-gathering characteristics

you can take a serious interest in

deep space astronomy even on a

modest budget. Newtonian

Reflector telescopes do require

more care and maintenance

because the primary mirror is

exposed to air and dust.

However, this small drawback

does not hamper this type of

telescope’s popularity with

those who want an economical telescope that can still resolve faint, distant objects.

Figure 3-2

Image orientation as seen with the

unaided eye & using erecting devices

on refractors & Newtonians

Inverted image, normal with

Newtonians & as viewed with

eyepiece directly in a refractor

Reversed from left to right, as

viewed using a Star Diagonal on a

refractor

The image orientation changes depending on how the eyepiece is inserted into the telescope. When using a star

diagonal with refractors, the image is right-side-up, but reversed from left-to-right (i.e., mirror image). If inserting

the eyepiece directly into the focuser of a refractor (i.e., without the diagonal), the image is upside-down and

reversed from left-to-right (i.e., inverted). However, when using the AstroMaster refractor and the standard erect

image diagonal, the images is correctly oriented in every aspect.

Newtonian reflectors produce a right-side-up image but the image will appear rotated based on the location of the

eyepiece holder in relation to the ground. However, by using the erect image eyepiece supplied with the

AstroMaster Newtonians, the image is correctly oriented.

Figure 3-3

To focus your refractor or Newtonian telescope, simply turn the focus knob located directly below the eyepiece

holder (see Figures 1-1 and 1-2). Turning the knob clockwise allows you to focus on an object that is farther than

the one you are currently observing. Turning the knob counterclockwise from you allows you to focus on an object

closer than the one you are currently observing.

Note: If you wear corrective lenses (specifically glasses), you may want to remove them when observing with an

eyepiece attached to the telescope. However, when using a camera you should always wear corrective lenses to

ensure the sharpest possible focus. If you have astigmatism, corrective lenses must be worn at all times.

The Star Pointer is the quickest and easiest way to point your telescope exactly at a desired object in the sky. It's

like having a laser pointer that you can shine directly onto the night sky. The Star Pointer is a zero

magnification pointing tool that uses a coated glass window to superimpose the image of a small red dot onto

the night sky. While keeping both eyes open when looking through the Star Pointer, simply move your

telescope until the red dot, seen through the Star Pointer, merges with the object as seen with your unaided eye.

The red dot is produced by a light-emitting diode (LED); it is not a laser beam and will not damage the glass

window or your eye. The star pointer is powered by a long life 3-volt lithium battery (#CR1620) see Figure 3-4.

Like all finderscopes, the Star Pointer must be properly aligned with the main telescope before it can be used.

The alignment procedure is best done at night since the LED dot will be difficult to see during the day.

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