Celestron CGX 800 Rowe-Ackermann Schmidt Astrograph RASA Telescope #12058 For Sale
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Celestron CGX 800 Rowe-Ackermann Schmidt Astrograph RASA Telescope #12058:
$4599.00
Celestron CGX 800 Rowe-Ackermann Schmidt Astrograph RASA TelescopeSKU: CNCGX800RMfr. Part: 12058
Item Includes8 " Rowe-Ackermann Schmidt Astrograph RASA Telescope - M42 Camera Adapter - C-thread Camera Adapter - Fan Battery Pack - CGX Equatorial Head - CGX Tripod - Accessory Tray - 2 x 11 lbs counterweight - NexStar+ Hand Control - 8 mm Allen Wrench - 12VDC Power Cable - 2-Year Warranty
DescriptionThis kit combines the 8" Rowe-Ackermann Schmidt Astrograph (RASA) with the state-of-the-art CGX German equatorial mount. Simply add a camera and this package offers everything you need to take spectacular images of wide-field deep sky objects. Although about the same size as the CGEM II, the CGX is a big step up in performance and features, especially for imaging applications. RASA Performance Made for Everyone
Capture spectacular wide-field deep sky images in seconds with Celestron\'s new portable astrograph, the 8" Rowe-Ackermann Schmidt Astrograph (RASA). This incredibly fast f/2.0 system is the perfect companion to today\'s color astronomical CMOS cameras, smaller CCD cameras, and mirrorless cameras. Thanks to its fast focal ratio and patented optical design, you can produce sharp, detailed images and, in many cases, skip the autoguider completely. Weighing in at just 17 pounds, it\'s easy to transport your 8" RASA to the most remote dark sky locations. The 8" RASA is an imaging telescope that delivers a flat field without optical aberrations for razor sharp stars across a wide field of view. It can capture stunning deep-sky astronomical images without the challenges typically presented by longer focal length instruments at a fraction of the cost of those systems. The latest addition to the RASA family, this 8" version is a much more portable and affordable version of the heralded RASA 11, which was introduced to much acclaim in 2014. With the 8" RASA joining the lineup, a wider range of astroimagers can enjoy the benefits of the RASA design. It has many of the same thoughtfully designed features as its "big brother" RASA 11, including the integrated air-cooling system, internal filter mount, and sturdy CGE dovetail mounting bar. Purely designed for imaging, the 8" RASA cannot be used visually. The prime focus focal plane is located at the front of the optical system, so it cannot accommodate a traditional eyepiece. Shorter Exposure Times and Virtual "Real-Time" Observing
Since it is an F/2.0 optical system, imagers can use shorter exposure times to capture detail in faint objects. When combined with sensitive cameras and the proper "live stacking" software, the 8" RASA can provide an almost real-time observing experience. View images on a computer instantly that are brighter and more detailed than can be seen in much bigger telescopes with the naked eye. Because shorter exposure times are possible, your equatorial mount won\'t need to accurately track over extended periods. The 8" RASA\'s relatively short 400mm focal length also lessens equatorial tracking demands. In many cases, autoguiding will not be required. Weighing only 17 lb, this optical tube pairs perfectly with a wide variety of mounts. Ultra-Stable Focus System
With the launch of the 8" RASA, Celestron is unveiling a new focuser design that mitigates lateral movement of the primary mirror when focusing, slewing, or tracking with the astrograph. Focusing is easier, more accurate, and more stable than ever. The key to the Ultra-Stable Focus System is two sets of precision bearings that are precisely aligned and tested during assembly to ensure optimal results. Built for Today\'s Latest Cameras
Unlike the larger RASAs that work with DSLR and large CCD cameras, the 8" model was designed with color astronomical CMOS cameras, smaller CCD cameras, and mirrorless cameras in mind. The telescope does not work with standard DSLR cameras. It is optimized for sensors with up to a 22mm diagonal, but performs well with sensors up to 32mm diagonal. The APS-C sized sensors used in many mirrorless cameras are a good choice. 42mm full frame sensors will also work, but performance will be poor at the edges of the sensor and field illumination will be reduced. Additionally, we do not recommend pairing RASA 8 with any camera body more than 4" in diameter. See the chart below to determine if your camera is compatible with RASA 8. Unique Optical Design RASA\'s optical design is patented (US 2016/0299331 A1). The design consists of a Schmidt corrector, primary mirror, lens group, and optical window. The lens group contains 4 elements and utilizes rare-earth elements. Unlike many telescopes that only perform well over the visible spectrum (400-700nm), the 8" RASA\'s optics are designed to perform over a wider spectral range, from 390-800nm. This allows more of the light emitted from the astronomical object to be sharply focused in the image. With many imaging systems, adding an extra piece of flat glass such as a filter does not change optical performance. However, that is not the case with super-fast optical systems like the RASA. Our engineers addressed this by designing the RASA with a removeable optical window, so you can maintain peak optical performance if a filter is added or if a camera has its own optical window. Celestron offers a Light Pollution Imaging Filter designed specifically for the 8" RASA, which mounts in place of the optical window. All refractive optical surfaces are coated with StarBright XLT coatings, while the primary mirror uses enhanced aluminum coatings. This maintains high light transmission through the entire optical system. When compared with "Hyperstar SCT" systems, the RASA 8 provides better optical performance and field illumination.FeaturesFlat field free of optical aberrations like field curvature, coma, astigmatism and chromatic aberration across an entire APS-C sensor.NEW Ultra-Stable Focus System six precision sealed ball bearings virtually eliminate image shift.Integrated air cooling system 12V DC MagLev fan reduces cooldown time and provides optimal air flow while filtering out dust.Internal filter mount seamlessly accommodates a Light Pollution Imaging Filter into the optical path.Performs over a wider spectral range than most telescopes, from 390-800 nm, so more of the light passing through the astrograph is in sharp focus.The CGX, with its 55 lb. load capacity, is Celestron\'s most innovative, state-of-the art, computerized equatorial mount to date, and provides a very sturdy and rigid platform for the fully-loaded RASA 8.The drive system utilizes low cog DC Servo motors with integrated optical encoders, belt and pulley motor connection, spring-loaded steel worm gears supported by precision sealed bearings, and brass worm wheels for smooth, accurate slewing and tracking performance with little backlash.Fully remote imaging capable, with optical limit switches, home sensors, through-mount cabling, and hard stops.Included Celestron PWI software allows direct computer control via USB 2.0 connection.Proven NexStar+ computerized telescope control technology supports functions to address imagers\' needs, such as All-Star Polar Alignment, Permanent Periodic Error Correction (PPEC), and adjustable tracking through meridian.SpecificationsOptical DesignRowe-Ackermann SchmidtAperture (mm)203 mm (8")Focal Length400 mm (15.74")Focal Ratiof/2.0Central obstruction diameter93 mm (3.66") (46% of aperture diameter)Light Gathering Power843xResolution (Dawes)0.57 arc secondsResolution (Rayleigh)0.68 arc secondsImage Circle22 mm (.86") ½, 3.15½Useable field32 mm (1.26") ½, 4.6½, only minimal performance loss at edge of FOVWavelength range390 - 800 nmSpot size< 4.6 ½m RMS across image circleOptical CoatingsStarBright XLTOff-axis Illumination93% at 11 mm (.43") off-axisOptical Window46 mm (1.81") ½Back focus with included camera adapter25 mm (.98")Back focus from top of threaded collar29 mm (1.14")Optical TubeAluminumOptical Tube Length628 mm (24.7")Optical Tube Diameter235 mm (9.3")FocuserUltra-Stable Focusing SystemFinderscopeNot includedOptical Tube Weight17 lbs (7.7 kg)Other FeaturesAir-cooling system, integrated filter mountDovetailCGE Dovetail BarOptical Tube InfoMount TypeComputerized EquatorialInstrument load capacity55 lbs (25 kg)Tripod height adjustment range200.15 mm - 1968.5 mm (47.25" - 77.5")Tripod leg diameter50.8 mm (2") Steel tripod with graduated markings on lower sectionLatitude adjustment range3 degree to 65 degreeMount Head Weight44 lbs (20 kg)Tripod Weight19.2 lbs (8.7 kg)Weight of Counterweights2 x 11 lbsAccessory TrayYesSlew Speed9 slew speeds - max speed 4 degree/secondTracking RatesSidereal, Solar and LunarTracking ModesEQ North & EQ SouthGPSN/ADovetail CompatibilityDual saddle plates (Vixen and CGE saddle)Number of Auxiliary ports2 (1x Hand control port and 1x AUX Port for optional accessories)Autoguide portYesUSB PortYes, Mount and Hand ControlPower Requirements12 VDC, 4 ampsMotor DriveLow cog DC servo motorsAlignment Procedures2-Star Align, Quick Align, 1-Star Align, Last Alignment, Solar Syst em AlignPeriodic Error CorrectionYesComputerized Hand Control2 line x 18 character backlit Liquid Crystal Display, 19 LED backlit buttons, USB 2.0 port for PC connectionDatabase40,000+ objects, 100 user defined programmable objects. Enhanced information on over 200 objectsSoftwarePWI Telescope Control Software, Celestron\'s Starry Night Special Edition Software, SkyPortal AppTotal Kit Weight124.2 lbs (56.3 kg) WHO WE ARE
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