Celestron NexStar 8i manual Care and Cleaning of the Optics Collimation

ASTRONOMY BASICS	28
The Celestial Coordinate System	28
Motion of the Stars	29
Polar Alignment (with optional Wedge)	30
Finding the North Celestial Pole	31
CELESTIAL OBSERVING	32
Observing the Moon	32
Observing the Planets	32
Observing the Sun	32
Observing Deep Sky Objects	33
Seeing Conditions	33
Transparency	33
Sky Illumination	33
Seeing	33
CELESTIAL PHOTOGRAPHY	35
Short Exposure Prime Focus Photography	35
Eyepiece Projection	36
Long Exposure Prime Focus Photography	37
Terrestrial Photography	39
CCD Imaging	39
TELESCOPE MAINTENANCE	40
Care and Cleaning of the Optics	40
Collimation	40
OPTIONAL ACCESSORIES	43
APPENDIX A – TECHNICAL SPECIFICATIONS	46
APPENDIX B – GLOSSARY OF TERMS	48
APPENDIX C –LONGITUDES AND LATITUDES	51
APPENDIX D – RS-232 CONNECTION	56
APPENDIX E – TIME ZONE MAPS	57
SKY MAPS	59

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