Celestron NexStar 90 GT Telescope
The Celestron NexStar 90 GT telescope is an achromat refractor for exciting exploration of the Solar System. It has intuitive controls that will not cause any difficulties even for a beginner. This is a device with a high degree of automation, capable, thanks to GoTo computer technology, of independently aiming at an object that you select using the control panel. More experienced users will appreciate achromatic optics, thanks to which the image in this telescope is free of color aberrations - in less advanced refracting telescopes they often reduce the quality of observations. The glass optics of the Celestron NexStar 90 GT telescope are fully coated, and two interchangeable eyepieces provide high magnification for detailed viewing of planetary disks. The kit also includes an accessory that turns the telescope into a powerful spotting scope for observing ground objects - a diagonal prism. To search for celestial bodies, a red dot finder is used, which is much more convenient than conventional optical ones. The telescope is mounted on an alt-azimuth mount using a classic dovetail mount. High-precision servo motors move silently and do not create vibrations that could interfere with observations. Commands to the mount are given using the NexStar+ remote control with an LCD screen. You can attach it to the accessory tray using a special holder, or you can use it remotely.
- Telescope type: refractor
- Optical design: achromat
- Optics material: optical glass
- Optics coating: full multilayer
- Lens diameter (aperture), mm: 90
- Focal length, mm: 910
- Maximum useful magnification, x: 180
- Aperture (relative aperture): 1:10.1
- Resolution, ang. seconds: 1.29
- Penetrating power (magnitude, approx.): 12.3
- Eyepieces included: 4 mm (228x), 20 mm (46x)
- Mounting diameter of eyepieces, inches: 1.25
- Finder: StarPointer, with red dot
- Tripod: aluminum
- Tripod height, mm: adjustable
- Tray for accessories: yes
- Type of telescope control: electric drives of both axes, auto-guidance
- Mount type: alt-azimuth, fully computerized
- Drive type: DC servo motors with enclosed optical encoders on both axes
- Backlash compensation: yes
- Optional: 90° (1.25") diagonal prism
- Pointing speed: 3 degrees per second
- Tracking speeds: sidereal, lunar, solar
- Software: planetarium program The Sky Level I with Sky Tour excursion mode
- Auto-guidance: yes
- Control panel: NexStar+
- Control panel specifications: 19-key, 2-line LCD screen
- Object database: more than 40,000, 100 user objects
- Update via the Internet: yes
- Power source: control panel: AA alkaline batteries – 8 pcs./12 V AC adapter (purchased separately); finder: lithium battery 3 V – 1 pc.
- Dovetail mount: yes
- User level: advanced
- Subject of observation: planets of the solar system, terrestrial objects