Celestron CGE925, CGE1100, CGE800, CGE1400 manual Fastar Compatible Optical System

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Secondary

Mirror

Secondary

Mirror

Retaining Ring

Corrector Plate

Secondary

Mirror Mount

Handle

Figure 7-2 - The Fastar Compatible Optical System

compatible CGE telescope's versatility allows it to be used in many different f-number configurations for CCD imaging. It can be used at f/2 (with optional Fastar Lens Assembly), f/6.3 (with the optional Reducer/Corrector), f/10, and f/20 (with the optional 2x Barlow) making it the most versatile imaging system available today. This makes the system ideal for imaging deep-sky objects as well as planetary detail. Described below is the configuration of each F-number and the type of object best suited to that kind of imaging.

The above figure shows how the secondary mirror is removed when using the optional CCD camera at f/2 and the Fastar Lens Assembly.

Warning: The secondary mirror should never be removed unless installing the optional Fastar Lens Assembly. Adjustments to collimation can easily be made by turning the screws on the top of the secondary mirror mount without ever having to remove the secondary mirror (see Telescope Maintenance section of this manual).

The F/# stands for the ratio between the focal length and the diameter of the light gathering element. A CGE1100 optical tube has a focal length of 110 inches and a diameter of 11 inches. This makes the system an f/10, (focal length divided by diameter). The CGE 800 has a focal length of 80 inches and a diameter of 8 inches, also making it an f/10 optical system. However, the CGE 1400 optical tube has a 154 inch focal length with a F-ratio of f/11. When the secondary is removed and the CCD camera is placed at the Fastar position, the system becomes f/2, this is a unique feature to some Celestron telescopes (see figures below).

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Contents CGE800 CGE925 CGE1100 CGE1400 User Defined Objects Telescope Maintenance Some of the many standard features of the CGE include CGE 1400 Shown 12v Output JackSetting up the Tripod Power SupplyCounterweight DiagonalAttaching the Center Leg Brace Attaching the Electronics PierInstalling the Counterweight Bar Installing the CounterweightCounterweight Locking Screw Safety Screw Washer Attaching the Equatorial MountAttaching the Optical Tube to the Mount Attaching the Visual BackDovetail Slide Bar Dovetail Locking Knobs Mounting Platform Installing the Star Diagonal Installing the EyepieceInstalling the Finderscope Adjusting the Mount Moving the Telescope ManuallyBalancing The Mount in R.A Balancing The Mount in DECPowering the Telescope Attaching the Motor CablesTransporting the CGE Page CGE Hand Control Named Stars Named ObjectsDouble Stars Variable StarsAlignment Procedures Startup ProcedureAuto Two-Star Align Auto One-Star AlignQuick-Align Last AlignmentCGE Re-Alignment Object Catalog Selecting an ObjectSlewing to an Object Finding PlanetsTour Mode Constellation TourDirection Buttons Rate ButtonSetup Procedures Identify Scope Setup Features Precise GoToObserving Tip Helpful Hint Utility Features Helpful Hint Page CGE Ready Image Orientation Focusing Calculating MagnificationDetermining Field of View General Observing Hints Celestial Coordinate System Motion of the Stars Latitude Scales Pointing at PolarisFinding the North Celestial Pole Declination Drift Method of Polar Alignment Observing the Moon Lunar Observing HintsObserving the Planets Planetary Observing HintsObserving the Sun Solar Observing HintsObserving Deep Sky Objects Seeing ConditionsSeeing Short Exposure Prime Focus Photography Eyepiece Projection FullLong Exposure Prime Focus Photography Planet ISO Moon Mercury Venus Mars Jupiter SaturnPeriodic Error Correction PEC Using Periodic Error Correction Terrestrial Photography MeteringReducing Vibration CCD ImagingFastar Compatible Optical System Fastar F/2 Imaging With Reducer/Corrector Medium size to small galaxiesPlanetary or Lunar Auto Guiding Care and Cleaning of the Optics CollimationCollimated telescope Should appear Symmetrical with Page At f/10 and 163 power with the CGE Page Technical Specifications Idle Current Appendix a Longitudes Latitudes Georgia Minnesota Rhode Island Canada Appendix B RS-232 Connection Communication ProtocolAdditional RS232 Commands Reset The Position Of Azm Or AltAppendix C Maps of Time Zones Page Page Page Page Page Page Page Celestron TWO Year Warranty