Celestron CGEM - 925 Computerized Manual de Usario

Celestron Telescopio CGEM - 925 Computerized

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INSTRUCTION MANUAL

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INTRODUCTION....................................................................................................................................................................................................................... 4

Warning.......................................................................................................................................................................................................... 4

ASSEMBLY................................................................................................................................................................................................................................. 6

Setting up the Tripod...................................................................................................................................................................................... 6

Attaching the Equatorial Mount..................................................................................................................................................................... 7

Attaching the Accessory Tray........................................................................................................................................................................ 8

Installing the Counterweight Bar.................................................................................................................................................................... 8

Installing the Counterweight .......................................................................................................................................................................... 8

Attaching the Hand Control Holder ............................................................................................................................................................... 9

Attaching the Optical Tube to the Mount....................................................................................................................................................... 9

Attaching the Visual Back............................................................................................................................................................................ 10

Installing the Star Diagonal.......................................................................................................................................................................... 10

Installing the Eyepiece ................................................................................................................................................................................. 10

Installing the Finderscope ............................................................................................................................................................................ 11

Installing the CGEM 1100 Finderscope....................................................................................................................................................... 11

Removing the Lens Cap ............................................................................................................................................................................... 13

Moving the Telescope Manually.................................................................................................................................................................. 13

Balancing the Mount in R.A......................................................................................................................................................................... 13

Balancing the Mount in DEC ....................................................................................................................................................................... 14

Adjusting the Mount .................................................................................................................................................................................... 14

Adjusting the Mount in Altitude................................................................................................................................................................... 14

Adjusting the Mount in Azimuth.................................................................................................................................................................. 15

Powering the Telescope ............................................................................................................................................................................... 15

HAND CONTROL....................................................................................................................................................................................................................16

Hand Control Operation ............................................................................................................................................................................... 17

Alignment Procedures.................................................................................................................................................................................. 17

Startup Procedure......................................................................................................................................................................................... 18

Two Star Align............................................................................................................................................................................................. 19

East/West Filtering .............................................................................................................................................................................. 19

Quick-Align ................................................................................................................................................................................................. 20

Last Alignment............................................................................................................................................................................................. 21

Re-Alignment............................................................................................................................................................................................... 21

Object Catalog.............................................................................................................................................................................................. 21

Selecting an Object....................................................................................................................................................................................... 21

Slewing to an Object .................................................................................................................................................................................... 22

Finding Planets ............................................................................................................................................................................................. 22

Tour Mode.................................................................................................................................................................................................... 22

Constellation Tour........................................................................................................................................................................................ 22

Direction Buttons.......................................................................................................................................................................................... 23

Rate Button................................................................................................................................................................................................... 23

Setup Procedures.......................................................................................................................................................................................... 23

Tracking Mode .................................................................................................................................................................................... 23

Tracking Rate ...................................................................................................................................................................................... 24

Date/Time............................................................................................................................................................................................ 24

User Deﬁned Objects .......................................................................................................................................................................... 24

Get RA/DEC ....................................................................................................................................................................................... 25

Goto R.A/Dec...................................................................................................................................................................................... 25

Identify ................................................................................................................................................................................................ 25

Precise GoTo................................................................................................................................................................................................ 25

Scope Setup Features.................................................................................................................................................................................... 25

Setup Time-Site................................................................................................................................................................................... 25

Anti-backlash ...................................................................................................................................................................................... 26

Filter Limits......................................................................................................................................................................................... 26

Direction Buttons ................................................................................................................................................................................ 26

Goto Approach .................................................................................................................................................................................... 26

Autoguide Rates .................................................................................................................................................................................. 27

OTA Orientation.................................................................................................................................................................................. 27

Meridian .............................................................................................................................................................................................. 27

Mount Settings .................................................................................................................................................................................... 27

RA Limits............................................................................................................................................................................................ 28

Utility Features ............................................................................................................................................................................................. 28

Calibrate Mount................................................................................................................................................................................... 28

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