Celestron NexStar 114SLT NEWTONIAN Manuel D'instructions page 17

Perfect collimation will yield a star image very symmetrical just inside and outside of focus In addition, perfect collimation
delivers the optimal optical performance specifications that your telescope is built to achieve
If seeing (i e , air steadiness) is turbulent, collimation is difficult to judge Wait until a better night if it is turbulent or aim to a
steadier part of the sky Stars in a steady part of the sky will be still, not twinkling
TIPS FOR COLLIMATION
1 If you feel any resistance while turning a screw, stop immediately and loosen the two screws on either side of the one you
are turning
2 Only make small adjustments to each screw; turning them only ¼ turn at a time
3 If your telescope appears collimated after star testing, it should not need adjustment again unless it is roughly handled
APPENDIX A: TECHNICAL SPECIFICATIONS
OPTICAL
SPECIFICATIONS
Optical Design
Aperture
Focal Length
Focal Ratio
Optical Coatings
Highest Useful
Magnification
Resolution: Rayleigh
Criterion Dawes Limit
Light Gathering Power
Eyepiece Magnification
Optical Tube Length
Model # 23091
NexStar 114SLT
Newtonian
114mm
450mm
3 95
Aluminium with SiO2
269x
1 22 arc seconds
1 02 arc seconds
265x unaided eye
18x (25mm)
50x (9mm)
18"
I 15
ENGLISH