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Congratulations on your purchase of the FirstScope telescope.  The FirstScope uses a Dobsonian Mount which is a 
simple, easy to use type – easy movement of altitude (up & down) and azimuth (side-to-side). The optical tube is a 
Newtonian reflector design.  The FirstScope 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.  

This telescope was designed for the First Time User offering exceptional value. The FirstScope features a compact 
and portable design with ample optical performance to excite any newcomer to the world of amateur astronomy.  In 
addition, your FirstScope telescope is ideal for terrestrial observations which will open your eyes with superb high 
power viewing – select the object, aim, point, and focus. 

The FirstScope telescope carries a 

two year limited warranty

.    

Some of the standard features of the FirstScope include: 

All coated glass optical elements for clear, crisp images.

Smooth functioning, rigid Dobsonian alt-azimuth mount with simple controls for easy targeting.

Designed to be used on a table top or other flat, sturdy surface.

Quick and easy set up.

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 

y

 

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. 

y

 

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. 

y

 

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. 

y

 

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. 

Summary of Contents for FirstScope 21024

Page 1: ...F Fi ir rs st tS Sc co op pe e I In ns st tr ru uc ct ti io on n M Ma an nu ua al l M Mo od de el l 2 21 10 02 24 4...

Page 2: ...General Observing Hints 7 The Celestial Coordinate System 8 Motion of the Stars 9 CELESTIAL OBSERVING 10 Observing the Moon 10 Lunar Observing Hints 10 Observing the Planets 10 Observing Deep Sky Obje...

Page 3: ...and easy set up 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 ke...

Page 4: ...4 Figure 1 1 1 Focuser 6 Arm 2 Secondary Diagonal Mirror inside 7 Tube End 3 Optical Tube 8 Primary Mirror inside 4 Lock Nut 9 Focus Knob 5 Base 10 Eyepiece 10 9 8 7 6 5 4 3 2 1...

Page 5: ...er see the section on Calculating Magnification The eyepiece fits directly into the focuser To attach the eyepieces 1 Make sure the thumbscrews are not protruding into the focuser tube Then insert the...

Page 6: ...ll 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 astron...

Page 7: ...t you are observing To calculate the actual field of view divide the apparent field of the eyepiece supplied by the eyepiece manufacturer by the magnification In equation format the formula looks like...

Page 8: ...rth and separates the northern celestial hemisphere from the southern Like the Earth s equator it bears a reading of zero degrees On Earth this would be latitude However in the sky this is referred to...

Page 9: ...use the sunlight during the day washes out the starlight However part of this circular motion of stars in this region of the sky can be seen by setting up a camera on a tripod and opening the shutter...

Page 10: ...see the moons of Jupiter as they orbit the giant planet Saturn with its beautiful rings is easily visible at moderate power Planetary Observing Hints y Remember that atmospheric conditions are usually...

Page 11: ...than you can with the naked eye y Binoculars a helpful tool in locating bright stars and searching an area you are looking for objects in Can be a substitute or supplement to a finderscope y Books sev...

Page 12: ...necting the two stars 6 Look through the telescope and the Ring Nebula should be in your field of view The Ring Nebula s angular size is quite small and difficult to see 7 Because the Ring Nebula is r...

Page 13: ...ound around major urban areas LPR filters enhance deep sky viewing from light polluted areas by blocking unwanted light while transmitting light from certain deep sky objects You can on the other hand...

Page 14: ...ted If moisture condenses on the inside of the optics remove the accessories from the telescope Place the telescope in a dust free environment and point it down This will remove the moisture from the...

Page 15: ...osed on the primary mirror Figure 6 2 If the primary mirror is not centered in the secondary mirror adjust the secondary mirror screws by alternately tightening and loosening them until the mirror is...

Page 16: ...Length 300mm Focal Ratio f 4 Optical Coatings Coated Eyepieces 1 25 Barrel 20mm 15x 4mm 75x Apparent FOV 20mm 25 and 4mm 33 Angular Field of View w 20mm eyepiece 1 7 Linear FOV w 20mm ft 1000yds m 10...

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