National Geographic NG90EQ Instructions And Owner'S Manual Download Page 1 | Manualshive

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NG90EQ

Maksutov-Cassegrain

Telescope

Instructions

and

Owner’s Manual

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Summary of Contents for NG90EQ

Page 1: ...NG90EQ Maksutov Cassegrain Telescope Instructions and Owner s Manual...

Page 2: ...lescope at the sun or even close to the sun Instant and irreversible damage can occur including blindness Do not let children use any telescope without adult supervision A B C D E F G H I J K L M N O...

Page 3: ...ews of the moon s craters Jupiter s major moons and Saturn s rings in addition to dozens of galaxies star clusters and nebulae As a terrestrial land telescope the NG90EQ delivers great views of mounta...

Page 4: ...op of each leg Position one of the three arms of the equatorial mount so that it fits between the leg sections Insert a bolt through the first tripod section then through the equatorial mount arm and...

Page 5: ...nsert the two slotted chromed screws through the inner holes so that they engage with the two threaded holes on the underside of the main optical unit Tighten these with a screwdriver See Fig 4 Fig 4...

Page 6: ...kwise to tighten it Then insert the threaded end of the counterweight rod into the equatorial mount and turn it clockwise until it stops See Fig 9 and Fig 10 Fig 8 Fig 9 Fig 10 8 Attach the long slow...

Page 7: ...FINDER SCOPE ALIGNMENT Since a telescope has a narrow field of view by design it can be challenging to locate a particular star or planet For this reason the telescope is fitted with a low power wide...

Page 8: ...ed with an advanced equatorial mount This type of mount moves the main optical tube in a circular fashion This is very important because it means that you can set up the NG90EQ to conveniently compens...

Page 9: ...the declination slow motion control knob extending from the back of the telescope will counteract this slight error See Fig 22 Fig 22 A WORD ABOUT THE TWO EYEPIECE PORTS The NG90EQ is fitted with two...

Page 10: ...escope 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 magnificati...

Page 11: ...lessen these effects A common mistake made by many beginners is to start an observation session by placing the high power 9 mm eyepiece and the 3X Barlow lens in the telescope at the same time This i...

Page 12: ...e to side and up and down The following directions will explain how to set up the equatorial mount to operate in such a manner Loosen the right ascension tightening knob See Fig 23 and carefully rotat...

Page 13: ...ts you cannot remove the particles take the telescope to an optical professional for cleaning If you keep the dust caps on your telescope when it is not in use and avoid handling the lenses or mirrors...

Page 14: ...ing you will see that they change position relative to each other and to Jupiter It is possible with careful planning to actually see one of the moons disappear either in front of or behind Jupiter as...

Page 15: ...lescope objects in the sky appear to move Why is that When you observe an astronomical subject through a telescope the constant rotation of the Earth makes things appear to move across the viewing are...

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