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Orion 9877 manual User Guide, Optical Vision Limited, using telescopes or binoculars

Models: 9877

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Astronomical

®

Astronomical

Telescope

User Guide

WARNING!!

Never point the telescope directly at or near the Sun at any time. Observing the Sun, even for a fraction of a second, will result in instant and ir reversible eye damage. Please ensure minors ar e supervised by an adult conversant with this real danger when

using telescopes or binoculars.

OPTICAL VISION LIMITED

www.opticalvision.co.uk

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Orion 9877 manual User Guide, Optical Vision Limited, using telescopes or binoculars, Astronomical Telescope

Contents

User Guide using telescopes or binocularsOPTICAL VISION LIMITED Astronomical TelescopeTypes of Telescope The refractorThe catadioptric ALT-AZ ALT-AZ Telescopes & MountsEQ-5 AZ-3 EQ3-2 EQ-2 EQ-1Aligning the finderscope Attaching the finderscopeTelescope basics Calculating the telescopes magnificationMagnification = focal length of telescope focal length of eyepieceField of view degrees = the concepts contained within it Using your telescop ePage Page Polar axis alignment approximate settingSetting up and using an The equatorial mountingaltitude alignment precise settingPolar axis alignment Polar axis elevationPolar axis azimuth alignment The setting circlesCalibrating the declination circle Appendix Using the setting circlesFigure Figure Tips on observing with your telescopethat has one Get to know the skyto cover the seven principal stars that delin- eate the figure of Orion special filters that can almost magically remove the orange cast to the sky created by sodium streetlights revealing a dark, star- studded sky beyond. These filters are not cheap - you can spend £100 quite easily for two for a pair of binoculars - but to the tele- scope user they are almost mandatory for any serious work concerned with hunting for galaxies and faint nebulae CLEANING