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NG 50M M
50 M M TA B LE TO P T ELE SCO PE
W I T H AZ MO U NT
IN STRUC TI ON MA N UAL
WARNING:
SUN HAZARD — Never look directly at the sun
with this device.
WARNING:
CHOKING HAZARD — Small parts.
Not for children under 3 years.
WARNING:
The lens contains lead that may be harmful.
Wash hands after touching.
WARNING:
This product can expose you to chemicals including lead,
which is known to the State of California to cause cancer.
For more information go to www.P65Warnings.ca.gov.
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8 0 -1 0051
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Summary of Contents for National Geographic NG50MM
- Page 1 8 0 -1 0051 NG 50M M 50 M M TA B LE TO P T ELE SCO PE W I T H AZ MO U NT IN STRUC TI ON MA N UAL WARNING: WARNING: SUN HAZARD — Never look directly at the sun The lens contains lead that may be harmful.
- Page 2 READ AND FOLLOW THE INSTRUCTIONS BEFORE USE. IMPORTANT SAFETY INSTRUCTIONS KEEP THESE INSTRUCTIONS FOR LATER USE. • SUN WARNING: WARNING: NEVER ATTEMPT TO OBSERVE THE SUN WITH THIS DEVICE! OBSERVING THE SUN – EVEN FOR A MOMENT – WILL CAUSE INSTANT AND IRREVERSIBLE DAMAGE TO YOUR EYE OR EVEN BLINDNESS.
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Page 3: Parts Overview
Parts Overview 1. Focus Wheel 2. Diagonal Mirror 3. Eyepieces (12.5 mm, 20 mm) 4. Telescope Tube 5. Dew Shield 6. Objective Lens 7. Locating Screw For The Vertical Adjustment 8. Locating Screw For The Vertical Axis 9. Tripod Legs Available Downloads Visit: www.esmanuals.com... -
Page 4: How To Set Up
Telescope Terms To Know: Diagonal: A mirror that deflects the ray of light 90 degrees. With a horizontal telescope tube, this device deflects the light upwards so that you can comfortably observe by looking downwards into the eyepiece. The image in a diagonal mirror appears upright, but rotated around its vertical axis (mirror image). -
Page 5: Troubleshooting Guide
To make things simpler. I’ve put together a table with some magnifications: Telescope Eyepiece Magnification Focal Width Focal Width 360 mm 20 mm 360 mm 12.5 mm 28.8x Technical Data: • Design: Achromatic • Focal Length: 360 mm • Objective Diameter: 50 mm Possible Objects for Observation: Terrestrial Images f=26 mm... - Page 6 Types Of Telescopes: Focuser Light Focuser Primary Mirror Secondary Mirror (Objective) Light Light Focuser Primary Mirror Secondary Mirror (Objective) Light Reflector A reflector telescope uses mirrors to gather and focus light. Light enters the telescope through its open Light front end and travels to the concave primary mirror at the back. From there the light is reflected back up Primary Mirror the tube to a flat secondary mirror, which sits at a 45°...
- Page 7 Telescope Terms to Know: Focal Length Objective Lens Eyepiece Eyepiece (mm) Focuser Aperture (mm) Diagonal Focal Point Focal Length Telescope (mm) Focal Length Eyepiece Eyepiece (mm) Focuser Focal Point Aperture Primary Mirror Secondary (mm) (Objective) Mirror Focal Length Telescope (mm) Aperture: This figure, which is usually expressed in millimeters, is the diameter of a telescope’s light-gathering surface (objective lens in a refractor or primary mirror in a reflector).
- Page 8 Aperture 102mm Eyepiece Focal Length 20mm Telescope Focal Length Magnification: 1000mm The magnification corresponds to the difference between observation with the naked eye and observation through a magnifying device like a telescope. If a telescope configuration has a magnification of 30x, then an object viewed through the telescope will appear 30 times larger than it would with the naked eye.
- Page 9 Eyepiece Lens Short Eye Relief Distance Long Eye Relief Distance Exit Pupil (mm) Eyepiece Lens Eyepiece Lens Eyepiece Lens Eye Relief Eye relief is all about a comfortable viewing experience because it is the distance at which you need to position your eye from the eyepiece’s outermost surface to enjoy the full field of view.
- Page 10 Notes:...
- Page 11 Notes:...
- Page 12 © National Geographic Partners LLC. All rights reserved. NATIONAL GEOGRAPHIC and Yellow Border Design are trademarks of the National Geographic Society, used under license. © Explore Scientific, LLC 1010 S. 48th Street, Springdale AR 72762. All rights reserved. Made in China.