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Celestron NexStar 8″ (203.2mm)
Schmidt-Cassegrain Telescope with GoTo and Tripod
Used item in good working condition. Comes in 2 original boxes with some eyepiece, manual instructions but no finder scope. I bought this telescope around 4 years ago but never really had time to use it properly so its been sitting in my garage for a while. Everything should work as should but I never use GoTo system. Some more specs and info about telescope below:
Celestron developed this telescope in order to provide a relatively affordable, very easy to use “Go-To” computer controlled telescope with better rigidity than the Celestar 8 telescope. This will be a telescope to be considered by those who are interested primarily in visual applications, or for the photography of terrestrial objects including birds or other wildlife at great distances. The ability to precisely move the telescope up or down or left or right (without the astronomical clock drive continuously moving the telescope) makes this a platform to be considered for terrestrial and other applications where exact positioning is required.The NexStar 8 (with appropriate optional hardware) is also suitable for short exposure imaging of planets, the moon or the Sun (with suitable filter). Some of the features found in the Celestar 8 Deluxe and Ultima 2000 Computer Controlled telescopes which suit them better to long term “Deep Sky” astrophotography (“Fastar” capability, CCD auto guider port, Periodic Error Control, etc.), and manual controls were purposely omitted on the NexStar in order to provide the same high quality of SCT view which Celestron is known to be capable of, with the “Go-To” capability at moderate cost. This is also the first telescope we have seen come out of Celestron where it seems that a highly competent styling designer was consulted; it is a very attractive telescope with nicely made, finished, and well fitted components.Sophisticated Simplicity:
The NexStar operating system is sophisticated in its engineering and programming, this is in order to make the resulting observing experience nearly “idiot proof” – simple and fun to use. Set up is quick thereby inspiring you to take the telescope out more often, while leaving you time to enjoy yourself and your observing. The complete telescope optical tube assembly with the single tine fork mount (a first for the 8 inch SCT) and the standard telescope weighs just about 21.5 lbs. (9.8 kg), the furnished lightweight aluminum field tripod adds another 10 lbs (4.6 kg). This remains a good telescope for anyone who can push a button: the youngster, or elderly astronomer on the go who can not manage the more substantial or complicated telescopes.Single Tine Fork Mount:
This is the first single tine fork ever offered with an SCT as large as this 8 inch, and yet this is a more rigid metal fork mount and base than that which is furnished with the Celestar 8 telescope. The fork tine incorporates a recessed compartment to conveniently hold the contoured NexStar Keypad Controller; one may operate this telescope with this keypad in place or remove it and then command the telescope with the keypad in hand since it remains connected to the telescope by a flexible coiled cable resembling a telephone cord. This telescope mount is not designed to be moved manually, and so all control functions should be made through commands through the keypad controller.The adjustable height lightweight aluminum tripod furnished by Celestron with the NexStar 8 is economical but just barely adequate. And so, Company Seven is considering the production of a superior lightweight replacement for our customers; we also offer other compatible tripods made by Celestron.The optical encoders are fully enclosed in the fork mount; this provides for good protection of the encoders. The encoders provide continuous feed back of position to the Keypad Controller displayElectronics and Computer Software Features:
The electronics control system includes a totally cordless, smooth moving and nearly silent drive system. User input and 16 bit computer feedback are provided through the NexStar Keypad Controller. The controller incorporates a dual line, 16 character Liquid Crystal Display (LCD) display which is back lit for easy use in the dark.Left: NexStar Hand Control (22,834 bytes).The NexStar 8 operating system provisions include:database storing the location of 18,473 objects: includes entries from the Messier, NGC and Caldwell catalogs as well as planets, and selected SAO objects.
storage memory for 25 user programmable objects: up to 5 terrestrial, and up to 20 astronomical.
storage memory for 10 user programmable observing sites (input at site, or by entering longitude and latitude in advance).
Tour Function: selects the best and most spectacular objects available for you to observe.
four astronomical tracking rates: King, Sidereal, Lunar and Solar.
nine slew or correction speeds: 6.5 degrees per second, 3 Deg./Sec., 1.5 Deg./Sec., 128X Sidereal, 64X, 16X, 8X, 2X, 1X.
Cord Wrap protection: stops the telescope from rotating more than 360 degrees thereby preventing the wrapping an any external cord around the telescope. This menu selection may be disabled by the user when desired such as when operating the telescope from internal batteries.
Anti Backlash: All mechanical gears have a certain amount of backlash or play between the gears. This play is evident by how long it takes for a star to move in the eyepiece when the hand control arrow buttons are pressed (especially when changing directions). The anti-backlash features allows the user to compensate for backlash by inputting a value which quickly rewinds the motors just enough to eliminate the play between gears. The amount of compensation needed depends on the slewing rate selected; the slower the slewing rate the longer it will take for the star to appear to move in the eyepiece. Therefore, the anti-backlash compensation will have to be set higher. You will need to experiment with different values; a value between 20 and 50 is usually best for most visual observing, whereas a higher value may be necessary for photographic guiding.The telescope can track in either of four modes:If you have any questions or would like to inspect prior to purchase please feel free to message me
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Category: Cameras and Photography:Telescopes and Binoculars:Telescopes
Location: Scunthorpe