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Orion
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Lawn and Garden
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Telescope
Orion
9877 manual
Models:
9877
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approximate setting
Cleaning
using telescopes or binoculars
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Contents
OPTICAL VISION LIMITED
using telescopes or binoculars
User Guide
Astronomical Telescope
The refractor
Types of Telescope
The catadioptric
ALT-AZ ALT-AZ
Telescopes & Mounts
EQ-5
EQ-2 EQ-1
AZ-3 EQ3-2
Telescope basics
Attaching the finderscope
Aligning the finderscope
Calculating the telescopes magnification
Magnification = focal length of telescope
focal length of eyepiece
Field of view degrees =
Using your telescop e
the concepts contained within it
Page
Page
Setting up and using an
approximate setting
Polar axis alignment
The equatorial mounting
Polar axis alignment
precise setting
altitude alignment
Polar axis elevation
Polar axis azimuth alignment
The setting circles
Calibrating the declination circle
Appendix
Using the setting circles
Figure Figure
telescope
Tips on observing with your
Get to know the sky
that has one
to 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
