Orion StarBlast 4.5 Bedienungsanleitung

MEO Central Library

(757) 385-0150

and the Library Telescope Program of the

Back Bay Amateur Astronomers

WARNING: Never look directly at the Sun through this telescope or its finder

scope — even for an instant — as permanent eye damage could result. Do not

point the telescope at the Sun, as parts will melt! Children should use this

telescope only with adult supervision.

Orion Star last 4.5" Telescope

INSTRUCTION MANUAL

Introduction

The BBAA is a 501(c)(3) non-profit scientific and educational organization dedicated to “Bringing

Astronomy to the eople of Hampton Roads.” Founded on December 14, 1978, we are a group of

amateur astronomers drawn together by a common interest in observational astronomy. The BBAA is

an active member society of the Astronomical League [1] and a part of NASA’s Night Sky Network [2].

Visit backbayastro.org [3] to see our calendar of events, club information, newsletters and links to

astronomy-related sites. If you have a question for us please send an e-mail to [email protected]

[4].

lease feel free to bring this telescope and join us at our free monthly Skywatch event at the Northwest

River ark in Chesapeake, VA.

The BBAA provides ongoing support in education and maintenance of this telescope to our library

partners. Our goal is for you to gain a better understanding and appreciation of our universe through

your experience with the telescope. We hope you enjoy using it.

The BBAA would like to thank The New Hampshire Astronomical Society

who originally created this instruction manual.

Telescope Parts

1) Eyepiece (Zoom 8 to 24 mm)

2) EZ Finder with AA battery box

(See picture below)

3) Telescope tube

4) Focuser (See picture below)

5) Tube Clamp

6) Altitude Clamp

7) Mirror Assembly

8) Support

9) Handle

10) Eyepiece rack (removed)

11) Eyepieces

12) Mount Feet

13) Secondary Mirror Screws

14) Secondary Mirror

DO NOT TRY TO ADJUST THE ITEMS IN RED

Focuser

15) Focus wheels

16) Eyepiece securing screws

(Don’t attempt to adjust)

EZ Finder II

Transporting the Te escope

The easiest way to carry the scope is to use the handle (Number 9 in the picture on page 3). If the

scope is too heavy for you to do that you can place your forearm under the telescope tube when it

is in a level position, and lift, holding the upright support against your side. When in a car, simply

place the scope on a seat and use a seatbelt to secure it. The lap belt goes across the base, and the

chest belt should cross the tube.

Care and Maintenance

C eaning the enses or mirrors

Please don’t clean the mirrors. Let the Librarian know if they seem dirty. Eyepieces, however,

can get dirty fairly quickly, particularly when poked with fingers. lease don’t poke them as it’s

very easy to scratch the coatings. However, in case of minor smudges you might try using the

Lens en. First, brush away any dust. Give the cap a quarter twist to replenish the compound on

the cleaning tip inside, then uncover the tip and use it to clean the eyepiece. Be sure to store the

telescope with the dust caps on.

Aligning the Mirrors

Again, please don’t. If it seems that the telescope is in need of adjustment, please tell the Librarian.

Fog on the mirrors and eyepieces

One of the odd things that happens when star gazing is that dew forms on pretty much everything

(and everyone). The big mirror is tucked safely down at the bottom of the telescope, and so it

does not get much dew on it. Eyepieces, however, often have dew form on them, making them

useless until they warm up and dry out. If the eyepiece fogs up, wrap your hands around it for a

few moments. As it warms up, the fog should disappear. Please don’t wipe the lens with a tissue

or cloth as it has special coatings on it that could be damaged if you do. Please ask people to not

touch the lens… ever.

Telescope Magnification

The Eyepiece chart on the telescope shows what magnification you will have for each setting of

the Zoom Eyepiece. The “True Field” describes the width of the image in the eyepiece. A full

Moon is 30 arcminutes (or ½ of a degree) wide, so you could fit about 4 full Moons in the field of

view when using the 8mm setting. Change the Zoom setting until your target fits the eyepiece the

way you like. You will have to adjust the focus.

Getting Started

lease read the instructions and practice with the telescope inside before you take it out in the

dark. The image will be much better if you let the telescope cool down to air temperature before

you start observing.

This is a “ ush-to” telescope. Once you find what you are looking for, you can either watch the

object move through your “field of view” (what you see through the eyepiece) and then reposition

the telescope, or keep pushing the scope to hold the object in the center of the eyepiece. Objects

appear to move across the field of view faster at higher magnifications. This is because the field of

view becomes narrower. Like many reflector telescopes, the image in the eyepiece is upside

down. When looking at star charts you will have to keep this in mind. The Moon map on this

telescope is “flipped” so it matches what you see in the eyepiece.

This is important enough to say again:

WARNING: Never look directly at the Sun through this telescope or its finder scope — even for an

instant - as permanent eye damage could result. Do not point the telescope at the Sun, as parts will melt.

Young children should use this telescope only with adult supervision.

Do You Wear Eyeg asses?

If so, you will probably be able to observe with your glasses off by just refocusing the telescope to

your unaided vision. If your eyes are astigmatic, images will probably appear best with glasses

on. This is because a telescope’s focuser can accommodate for nearsightedness or farsightedness,

but not astigmatism.

Focusing the Te escope

Try out the telescope during the day when you can see what you’re doing. Remove the dust caps

from the eyepiece and telescope tube.

The “power” of a given telescope depends upon the eyepiece you use. This scope has a Zoom

eyepiece. Always start by using the telescopes’ lowest-power (turn the body of the Zoom so the

pointer is at “24”) to locate and center an object. Low magnification shows a larger area of sky in

the eyepiece, making finding and centering an object much easier.

Operating the EZ Finder

A “finderscope” helps you point the scope. It is similar to a rifle sight. The EZ Finder works by

projecting a tiny red dot onto a screen mounted in the front of the unit, so that when you look

through the screen, the red dot will appear to float in space. Turn the power knob clockwise until

you hear a “click” indicating that power is on. With your eye positioned near the rear of the

telescope, look through the EZ Finder with both eyes open to see the red dot. The intensity of the

dot can be adjusted by turning the power knob. Use the dimmest possible setting that allows you

to see the dot without difficulty. When the EZ Finder is properly aligned with the telescope, an

object that is centered on the EZ Finder’s red dot should also appear in the center of the

telescope’s eyepiece. Checking the alignment of the EZ Finder is easiest during daylight. Aim the

telescope at a distant object, such as the top of a telephone pole or chimney and center it in the

telescope’s eyepiece. Now, turn the EZ Finder on and look through it. The object should appear

near or under the red dot. If not: Without moving the telescope, use the EZ Finder’s left/right

(azimuth) and up/down (altitude) adjustment knobs to position the red dot on the object in the

eyepiece. If the red dot is centered on the object in the eyepiece, you’re done! The finder scope

has a battery pack attached to the telescope. To change batteries, just slide the cover off the pack,

and replace the two AA batteries. At the end of your observing session, be sure to turn the

power knob counterc ockwise unti it c icks off.

A ign the Finderscope

It is important that the finderscope and the telescope tube are parallel and pointing in the same

direction. With the eyepiece adjusted for low power (24 mm), aim the telescope in the general

direction of an object at least 1 4-mile away. Slowly rotate the focus wheels until the object

comes into sharp focus. Go a little bit beyond sharp focus until the image starts to blur again, then

reverse the rotation of the knob, just to make sure you’ve hit the exact focus point. When

focusing on stars, bring them to as small a point as possible.

Many “deep-sky” objects are big, but dim. Low magnification will be better for them. Once

you’ve centered an object in the eyepiece, you can switch to a higher magnification by twisting

the Zoom’s barrel towards the “8”. This is recommended for small and bright objects, like planets

and double stars. The Moon also takes higher magnifications well. You may have to refocus a

little after changing power. If you find that it’s awkward to put your eye up to the eyepiece, you

can rotate the telescope tube by loosening the knob on the tube clamp and moving the telescope

tube until the focuser is in a convenient position. Be sure to tighten it again!

You may find that the telescope tube is either too hard to move or does not stay in place. Use the

altitude adjustment tension knob (it holds the telescope to the upright part of the base) to find the

right level of tension.

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