Celestron NexStar Evolution 8 8" f/10 wireless go-to SCT Telescope

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Telescope of the Year for 2016-2019, a "grab and go" scope with larger aperature. "Best Telescope for Gadget Lovers" and dubbed "the coolest app-cessory in the galaxy" by Wired.com

Part Number: 12091

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Best Telescope for Gadget Lovers: Celestron NexStar Evolution

Hailed “the coolest app-cessory in the galaxy” by Wired.com, NexStar Evolution isn’t just the Best Telescope for Gadget Lovers, it’s a game-changer for amateur astronomy. This Schmidt-Cassegrain telescope, available in 6”, 8” and 9.25” apertures, generates its own WiFi network, so you can control it wirelessly using your smartphone or tablet. SkyPortal, Celestron’s free app for iOS and Android, provides an intuitive, user-friendly experience under the stars. In addition to wireless telescope control, it also includes a full-featured planetarium with over 120,000 celestial objects and audio descriptions for hundreds of the most popular planets, galaxies, and nebulae.
As if communicating wirelessly with your phone wasn’t cool enough, NexStar Evolution offers other enhancements to make your stargazing experience seamless. It’s the first telescope with a built-in lithium ion battery with enough juice to power a 10-hour stargazing marathon. There’s also a USB port so you can tap into the battery to charge up your mobile device if it’s running low. With NexStar Evolution on the scene, stargazing will never be the same.

Astronomy Magazine reviewed the Evolution 8" and calls it the closest thing to a "grab and go" scope with larger aperature. Read the review here.

Product Highlights

203mm Schmidt-Cassegrain OTA
2032mm Focal Length, f/10 Focal Ratio
StarBright XLT Optical Coating System
Wireless Control with iOS/Android App
NexStar Computer Hand Controller
Motorized and Computerized Fork Mount
Multiple Automatic Alignment Systems
40mm, 13mm Eyepieces, 90° Diagonal
Adjustable Stainless Steel Tripod
Rechargeable Battery, up to 10 Hour Runtime

The NexStar Evolution 8 203mm Schmidt-Cassegrain Telescope from Celestron is a powerful, portable, versatile and user-friendly telescope that can be used for observing everything from the Moon and planets to deep sky objects like galaxies and nebulae. Using Celestron's proprietary StarBright XLT multi-coating system, light transmission is increased throughout the entire optical path with anti-reflection multicoated lenses, highly reflective multicoated mirrors, and 4-element rare-earth glass. While the focal ratio is a slow f/10, the scope's precision tracking system allows it to be a competent astrophotography/astroimaging platform for the Moon and planets.

The Evolution comes with two ways to use and control it. The first is to simply download Celestron's free Navigator app for Android and iOS smartphones and tablets. The scope's WiFi provides the connection to the app and expands the capabilities and functionality, including an expanded database to over 120,000 objects with detailed information on more than 200 of those objects. Second is the iconic 4-line 18-character NexStar computer controller. This is a wired piece of hardware with a database of over 40000 celestial objects plus several astronomical catalogs including the Messier and Caldwell. Whether using the controller or mobile device, the system can assist in properly aligning the scope, provide tours of the objects and events visible whenever and wherever the user if viewing, and allows for manual direction and slew control.

Designed for portability, the Evolution features a long life lithium-ion phosphate battery providing up to 10 hours of continual use on a single charge. The scope comes with an AC power supply with plugs for the US, EU, UK, and AU outlets. The battery powers the servo motors, auxiliary accessory ports, a USB charging port, and the built-in WiFi. Manual clutches in both altitude and azimuth enable users to manually move and point the telescope when it's powered off.

Optical Performance

203.2mm (8") aperture
f/10 focal ratio
2032mm focal length
Crown optical glass primary mirror
StarBright XLT optical coatings: Multi-layer aluminum/SiO2 (quartz)/TiO2 (titanium dioxide)/Si02 (silicon dioxide) mirror coatings with flat reflectivity across the light spectrum for both astrophotography/astroimaging and visual observation
Multi-layer MgF2 (magnesium fluoride) and HfO2 (hafnium dioxide) anti-reflective lens coatings
High-transmission water white glass corrector lens with 97.4% light transmission
Internal focusing mechanism
Resolution: 0.69 arcsec (Rayleigh); 0.57 arcsec (Dawes)
Secondary mirror obstruction: 2.5"; 9.77% by area
Fastar capability: Secondary mirror can be removed and a DSLR or imaging rig mounted in its place for fast wide-field astrophotography

NexStar Controller

Two-line, 16-character LCD display
19 fiber optic backlit red LED buttons
Database of over 40000 celestial objects plus 100 user-defined
Automatically slew to planets, stars, constellations, and a variety of catalogs
Camera control: For piggyback wide field or conventional astrophotography through the OTA, the controller can automatically trigger the shutter release to capture the image
Anti-backlash compensation programs-out play between gears for more precise tracking
Tour Mode: Shows a selection of the most popular objects for the time and date you are observing
Constellation Tour: Allows the user to take a tour of all the best objects within a particular constellation
Alignment procedures: SkyAlign, Auto 2-Star, 1-Star, 2-Star, and Solar System
SkyAlign alignment: Takes minutes, with minimal effort or experience — point the telescope at three bright objects in the sky, and the telescope does the rest
Nine slew speeds: 4°/sec, 2°/sec, 1°/sec, 0.5°/sec, 2x, 4x, 8x,16x, and 32x
Sidereal, Solar, and Lunar tracking rates for observing the fast-moving Moon, to slower-moving deep space subjects
RS-232 communication port allows for computer control
Flash updateable via the Celestron website

Database Details:

Solar system objects including the sun, moon, and planets
Named Objects
Stars: Asterims, Variable stars, Double stars, Named stars
Caldwell catalog
Messier catalog
NGC catalog
SAO catalog
Constellations

Sky Portal App

Connect your smart device to the telescope via direct WiFi connection, no router required
Align and control the telescope from your device
App uses the device's camera and compass to determine location and what is available to see
Enjoy the same features as NexStar controller, but without wires
Expanded database to over 120,000 objects
Detailed information on over 200 popular objects including audio commentary, statistics, history, mythology, video and pictures
Database includes: Sun, moon, planets, star clusters, nebulae, galaxies, asteroids and comets, satellites, and the International Space Station
Simulate the night sky up to 100 years in the past, or future to plan an upcoming observing session
Compass Mode: Hold device up to the night sky and identify objects such as stars, planets, and galaxies; zoom in to view fainter objects not visible to the naked eye
Night Vision Mode: Preserves night-adjusted vision
Listen to more than four hours of audio narration to learn the history, mythology, and science of astronomy and the night sky
Works as a stand-alone planetarium app
Free for Android or iOS mobile devices
Apple iOS 7.0 and later, or Android 4.0 and later

Mount and Tripod

Mount:

Motorized single-arm alt-azimuth fork mount
Altitude and azimuth clutches to manually point the telescope when it is powered off
Brass worm gears with steel ball bearings provides smooth movement with reduced vibration
146mm diameter/180-tooth stainless steel worm wheels
Ports: One port for NexStar+ controller; One 5 VDC USB charging port for smartphones and small electronics; Three auxiliary ports for optional accessories such as StarSense AutoAlign system
Runs on one internal rechargeable 9.6V, 4.5Ah lithium iron phosphate (LiFePO4) battery
Includes power supply with USA, EU, UK, and AU plugs

Tripod:

Stainless steel two-section legs
Adjustable-height accommodates a variety of
Spikes at the end of the legs provide a sure footing on soft or uneven ground
Tray keeps accessories and equipment safe and organized
No tools required to set up mount and tripod

Included Accessories

Eyepieces:

1.25" diameter barrel accept most filters
Anti-reflection multicoated glass
Fold down rubber eyecups for use with or without eyeglasses
40mm eyepiece produces 51x magnification
13mm eyepiece produces 156x magnification

Diagonal:

1.25" snout and eyepiece holder
90° angle places head in comfortable position when OTA is pointed at or near the zenith
Star mirror diagonal corrects view horizontally, but not vertically

Finder:

Projects a single red dot in line of sight
Unmagnified view ensures a wide field of view to make finding objects faster and star-hopping navigation easier

Specifications

Alignment Procedures	SkyAlign, 3-Star Align, Solar System Align
Aperture	203.2 mm
App Database	Over 120,000 including 220 of the best deep sky and solar system objects
Communication Ports	1 hand control and 3 aux ports for optional accessories
Finderscope	StarPointer
Focal Length	2032 mm
Focal Length of Eyepiece 1	40 mm
Focal Length of Eyepiece 2	13 mm
Focal Ratio	10
HIghest Useful Magnification	480x
Light Gathering Power (Comp...	843x
Limiting Stellar Magnitude	14
Lowest Useful Magnification	29x
Magnification of Eyepiece 1	51x
Magnification of Eyepiece 2	156x
Max Slew Speed	4 degrees per second
Mount Info:	N.A.
Mount Type	Single Fork Arm Altazimuth
Optical Coatings	StarBright XLT
Optical Design	Schmidt Cassegrain
Optical Tube Info:	N.A.
Optical Tube Length	17 in
Power Requirements	Internal battery included
Resolution (Dawes)	0.57 arc seconds
Resolution (Rayleigh)	0.69 arc seconds
Secondary Mirror Obstructio...	9.77%
Secondary Mirror Obstruction	2.5 in (64 mm)
Star Diagonal	1.25"
Total Telescope Kit Weight	40.6 lbs
Tracking Rates	Sidereal, solar and lunar
Tripod	Stainless Steel
USB Charge Port	Yes

In the Box

Celestron NexStar Evolution 8 203mm f/10 Schmidt-Cassegrain GoTo Telescope

NexStar+ Hand Control (EQ)

StarPointer Finderscope

13mm Eyepiece

40mm Eyepiece

90° Star Diagonal

Tripod with Accessory Tray

AC Adapter with US, EU, UK, and AU Plugs

Limited 2-Year Warranty

Based on Astronomy magazine’s telescope "report cards", scopes of this size and type generally perform as follows . . .
Terrestrial Observation: Observing terrestrial objects (nature studies, birding, etc.) is usually possible only with refractor and catadioptric telescopes, and convenient only when the scope is on an altazimuth mount or photo tripod. Most reflectors cannot be used for terrestrial observing. Scopes with apertures under 5" to 6" are generally most useful for terrestrial observing due to atmospheric conditions (heat waves and mirage, dust, haze, etc.) that degrade the image quality in larger scopes.	No
Lunar Observation: Visual observation of the Moon is possible with any telescope. Larger aperture scopes will provide more detail than smaller scopes, thereby getting a higher score in this category, but may require an eyepiece filter to cut down the greater glare from the Moon's sunlit surface so small details can be seen more easily. Lunar observing is more rewarding when the Moon is waxing or waning as the changing sun angle casts constantly varying shadows to reveal craters and surface features by the hundreds.	Great
Planetary Observation:	Good
Binary and Star Cluster Observation:	Very Good
Galaxy and Nebula Observation:	Good
Photography:	Yes
Terrestrial Photography: Photographing terrestrial objects (wildlife, scenery, etc.) is usually possible only with refractor and catadioptric telescopes, and convenient only when the scope is on an altazimuth mount or photo tripod. Most reflectors cannot be used for terrestrial photography. Scopes with focal ratios of f/10 and faster and apertures under 5" to 6" are generally the most useful for terrestrial photography due to atmospheric conditions (heat waves and mirage, dust, haze, etc.) that degrade the image quality in larger scopes.	No
Lunar Photography: Photography of the Moon is possible with virtually any telescope, using a 35mm camera, DSLR, or CCD-based webcam (planetary imager). While an equatorial mount with a motor drive is not strictly essential, as the exposure times will be very short, such a mount would be helpful to improve image sharpness, particularly with webcam-type cameras that take a series of exposures over time and stack them together. Reflectors may require a Barlow lens to let the camera reach focus.	Yes
Planetary Photography:	Yes
Star Cluster / Nebula / Galaxy Photography:	Yes

WiFi Tips for NexStar Evolution

Please note the following for the most reliable WiFi connection to the telescope:

Areas with high WiFi traffic, such as large star parties or crowded public spaces, can potentially pose difficulties connecting to the telescope. Additionally, multiple smart devices and multiple WiFi telescopes in the same area can generate conflicting traffic. Follow these tips to maintain the most robust connection to your telescope.

If you experience lag or connection problems in areas with high WiFi traffic - To minimize possible connection problems in high traffic areas, select a viewing site with minimal WiFi traffic. Numerous nearby devices with WiFi enabled can contribute to unwanted WiFi traffic. Disabling WiFi in nearby devices can improve connectivity to your telescope. Alternatively, high traffic areas may require the use of the included NexStar+ hand control instead of the SkyPortal app over WiFi.
If you experience conflicts when using multiple devices to control a telescope - If you have multiple smart devices, and have connected to the same WiFi telescope previously with them, then be careful of both devices unintentionally communicating to the telescope at the same time. For example, if you have previously used your smartphone to control the telescope and later use a tablet to control the same telescope, the smartphone may interfere with the telescope connection. We recommend “forgetting” the telescope WiFi network with any smart devices not currently in use.
If you experience conflicts when multiple WiFi telescopes are in the same area - If you are using multiple WiFi telescopes and have connected to them with your smart device previously, we recommend “forgetting” the other telescopes/devices not currently in use. This way, you won’t accidentally connect to the other telescopes/devices. This is especially useful at a star party where more than one WiFi telescope may be in range.

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