Celestron CGEM 1100, CGEM 800, CGEM 925 instruction manual - page 3

3
Home Position................................................. ........................................................................................... ......................................... 29
Light Control................................................. ........................................................................................... ........................................... 29
Factory Settings............................................................... ........................................................................................... .........................29
Version.......................................... ........................................................................................... ........................................................... 29
Get Axis Position........................................................................................ .................................................................................... .....29
Goto Axis Position..................... ........................................................................................... .............................................................. 29
Hibernate................................................. ................................................. ................................................. .......................................... 29
Sun Menu............................ ........................................................................................... ..................................................................... 29
Scrolling Menu........................................................ ........................................................................................... .................................30
Set Mount Position.......................................... ........................................................................................... ......................................... 30
Set Mount Position............................................................... .................................................................................... .................................... 30
Turn On/Off GPS............................ .................................................................................... ................................................................ 30
Turn On/Off RTC........................................................ ........................................................................................... .............................30
Periodic Error Correction............................ ........................................................................................... ............................................. 30
TELESCOPE BASICS.................................................................................................... .................................................................. ........................................32
Image Orientation............................................................... ........................................................................................... ............................... 32
Focusing................................... ........................................................ ................................................. ........................................................ ... 33
Calculating Magnification.......................................... ........................................................................................... ....................................... 33
Determining Field of View............................................................... ........................................................................................... .................33
General Observing Hints................................... ........................................................................................... ................................................ 34
ASTRONOMY BASICS............................................................ .................................................................. .................................................................. ...........35
The Celestial Coordinate System..................................................................................... ............................................................................. 35
Motion of the Stars.......................................... ........................................................................................... .................................................. 36
Polar Aligning the Mount................................................. ........................................................................................... ................................. 37
Polar Align............................ ........................................................................................... ................................................................... 37
Finding the North Celestial Pole...................................................................................... ............................................................................. 39
CELESTIAL OBSERVING...................................................... .................................................................. .................................................................. ...........40
Observing the Moon................................................. ........................................................................................... ......................................... 40
Lunar Observing Hints............................ ........................................................................................... .......................................................... 40
Observing the Planets................................................. ........................................................................................... ....................................... 40
Observing the Sun............................ ........................................................................................... ................................................................. 40
Solar Observing Hints..................... ........................................................................................... .................................................................. 41
Observing Deep Sky Objects...................................................................... ........................................................................................... .......41
Seeing Conditions.................................................................................... .................................................................................... .................41
Transparency................................... ........................................................ ................................................. ................................................. ... 41
Sky Illumination................................................. ........................................................................................... ............................................... 41
Seeing........................................................ ...................................................................... ............................................................................. 41
ASTROPHOTOGRAPHY...................................................................................................... .......................................................................................... ........43
Short Exposure Prime Focus Photography................................... ........................................................................................... ..................... 43
Eyepiece Projection................................................. ........................................................................................... .......................................... 44
Long Exposure Prime Focus Photography.............. ........................................................................................... .......................................... 46
Periodic Error Correction (PEC).............. ........................................................................................... ......................................................... 47
Using Periodic Error Correction........................................................ ........................................................................................... ................47
Terrestrial Photography.......................................... ........................................................................................... ........................................... 48
Metering................................... ........................................................ ................................................. ........................................................ ... 48
Reducing Vibration..................... .................................................................................... ............................................................................. 48
CCD Imaging..................... .................................................................................... ...................................................................................... 49
Auto Guiding............................................................... ........................................................................................... ...................................... 49
TELESCOPE MAINTENANCE.................................................................................................... .................................................................. ........................50
Care and Cleaning of the Optics........................................................ ........................................................................................... ................50
Collimation............................................................... ...................................................................... .............................................................. 50
OPTIONAL ACCESSORIES............................................................ .......................................................................................... ...........................................53
APPENDIX A –TECHNICAL SPECIFICATIONS.................. .............................. .............................. .............................. .............................. .................. 56
APPENDIX B –GLOSSARY OF TERMS............ .......................................................................................... ...................................................................... 57
APPENDIX C –RS-232 CONNECTION...... ........................................................................ .................................................................. ................................60
APPENDIX D –TIME ZONE MAP........................ .................................................................. .................................................................. ............................62
SKY MAPS...................................................... ........................................................................ .................................................................. ................................64