Celestron NexStar 80GTL User Manual
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INTRODUCTION .............................................................................................................................................................4
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ASSEMBLY.......................................................................................................................................................................5
Assembling the NexStar ..................................................................................................................................................6
Attaching the Telescope to the Tripod.........................................................................................................................7
Balancing the Telescope tube ......................................................................................................................................7
The Erect Image Diagonal...........................................................................................................................................7
The Eyepiece ...............................................................................................................................................................8
Focusing ......................................................................................................................................................................8
The Star Pointer Finderscope ......................................................................................................................................8
Star Pointer Installation ...........................................................................................................................................9
Star Pointer Operationn ...........................................................................................................................................9
Using your Solar Filter ..............................................................................................................................................10
HAND CONTROL ..........................................................................................................................................................11
Attaching the Hand Control.......................................................................................................................................11
Powering the NexStar................................................................................................................................................11
The Hand Control......................................................................................................................................................11
Hand Control Operation ................................................................................................................................................13
Alignment Procedure.................................................................................................................................................13
Auto-Align ................................................................................................................................................................13
Two Star Alignment ..................................................................................................................................................14
Quick-Align...............................................................................................................................................................15
NexStar Re-Alignment ..............................................................................................................................................15
Object Catalog...............................................................................................................................................................16
Selecting an Object....................................................................................................................................................16
Slewing to an Object .................................................................................................................................................16
Tour Mode.................................................................................................................................................................16
Direction Buttons ..........................................................................................................................................................17
Rate Button................................................................................................................................................................17
Set Up Procedures .........................................................................................................................................................17
Tracking Mode ..........................................................................................................................................................17
Tracking Rate ............................................................................................................................................................18
View Time-Site .....................................................................................................................................................18
Sidereal Time ........................................................................................................................................................18
Filter Limits...........................................................................................................................................................18
RS-232...................................................................................................................................................................18
User Defined Objects ............................................................................................................................................18
Get RA/DEC .............................................................................................................................................................19
Get Alt-Az .................................................................................................................................................................19
Goto R.A/Dec............................................................................................................................................................19
Goto Alt-Az...............................................................................................................................................................19
Utility Features..............................................................................................................................................................19
Setup Time-Site.....................................................................................................................................................19
Anti-backlash ........................................................................................................................................................19
Slew Limits ...........................................................................................................................................................20
Direction Buttons ..................................................................................................................................................20
Light Control .........................................................................................................................................................20
Select Model..........................................................................................................................................................20
TELESCOPE BASICS....................................................................................................................................................22
Focusing ....................................................................................................................................................................22
Image Orientation......................................................................................................................................................22
Calculating Magnification .........................................................................................................................................22
Determining Field of View........................................................................................................................................23
General Observing Hints ...........................................................................................................................................23
CELESTIAL OBSERVING ...........................................................................................................................................24
Observing the Moon ..............................................................................................................................................24
Lunar Observing Hints ..........................................................................................................................................24
Observing the Planets ............................................................................................................................................24
Planetary Observing Hints.....................................................................................................................................24