Celestron 4SE Appendix A - Technical Specifications, Optical, Electronic Specifications

Appendix A - Technical Specifications

Optical		Specification
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Design					Maksutov-Cassegrain Catadioptric
Aperture					4 inches (102mm)
Focal Length					52 inches (1325mm)
F/ratio of the Optical System					13
Primary Mirror:			Diameter		102mm
			Coatings		Multi-layer coating process
Secondary Mirror Spot Size					1.25"
Secondary Obstruction					34.4% by diameter; 11% by area
Corrector Plate:			Material		BK-7 Optical Glass
			Coatings		Starbright XLT®
Highest Useful Magnification					240x	( ~ 6mm eyepiece)
Lowest Useful Magnification (7mm exit pupil)					15x	( ~ 80mm eyepiece)
Resolution: Rayleigh Criterion					1.36 arc seconds
		Dawes Limit			1.14 arc seconds
Photographic Resolution					140 lines/mm
Light Gathering Power					212x unaided eye
Near Focus standard eyepiece or camera					~ 20 feet
Field of View: Standard Eyepiece					1.1º
		: 35mm Camera			1.51º x 1.04º
Linear Field of View (at 1000 yds)					52.5 feet
Magnification: Standard Eyepiece					53x
		: Camera			27x
Optical Tube Length					13.5 inches
Weight of Telescope					11 Lbs.
Weight of Tripod					10 lbs
Electronic Specifications
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Input Voltage					12 V DC Nominal
Batteries Required					8 AA Alkaline
Power Supply Requirements					12 VDC-750 mA (Tip positive)

Mechaniicall Speciifiicatiions

Motor: Type Resolution

Slew speeds

Hand Control

Fork Arm

DC Servo motors with encoders, both axes

.26 arc sec

Nine slew speeds: 4º /sec, 2º /sec, 1º/sec, .5/sec, 32x, 16x, 8x, 4x, 2x

Double line, 16 character Liquid Crystal Display 19 fiber optic backlit LED buttons

Cast aluminum, with integrated hand control receptacle

Software Specifications
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Software Precision		16 bit, 20 arc sec. calculations
Ports		RS-232 communication port on hand control
Tracking Rates		Sidereal, Solar, Lunar and King
Tracking Modes		Alt-Az, EQ North & EQ South
Alignment Procedures		SkyAlign, Auto Two-Star, Two-Star, One-Star, Solar System Align
Database		25 user defined programmable object.
		Enhanced information on over 100 objects
Total Object Database		38,181