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The NexStar Evolution 8 EdgeHD is an 8-inch Schmidt-Cassegrain on a motorized alt-az GoTo mount with built-in WiFi and StarSense AutoAlign. EdgeHD optics correct coma and field curvature across the field, so stars stay round to the edge of large camera sensors, which is the main step up from the standard C8 and from the original Evolution 8. StarSense platesolves the sky and aligns the scope automatically, and you can add calibration stars for tighter tracking on long exposures. It suits visual observers who want easy GoTo and astrophotographers shooting the Moon, planets and brighter deep-sky targets; serious long-exposure imagers still add an equatorial wedge or a German equatorial mount.
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Owners of the Evolution 8 line praise the EdgeHD optics, the stable mount and the convenience of WiFi and StarSense alignment. Astrophotographers note that field rotation limits unguided long exposures without a wedge.
The Celestron NexStar Evolution HD 8" is a computerized telescope with an 8" EdgeHD optical tube and built-in WiFi. EdgeHD optics are designed for astrophotography, with sharp performance to the edge of the field on large astronomy cameras and DSLR sensors. Stars stay pinpoint, without coma or field curvature. All optical surfaces have StarBright XLT coatings to increase light transmission and reduce internal reflections.
The telescope broadcasts a WiFi signal in a 30-foot radius when turned on. A smartphone or tablet connected to it becomes a wireless hand control, using Celestron's free SkyPortal app for iOS and Android. The app has a 120,000-object database and a Tonight's Best list based on observing time and location. It also offers hundreds of audio descriptions of popular objects. The StarSense AutoAlign accessory lets the telescope orient itself to the night sky in about three minutes. It can add up to 10 additional calibration stars for more accurate tracking.
A rechargeable internal lithium-iron-phosphate battery provides about 10 hours of observing. It recharges in less than three hours through the fork arm with the included AC adapter. The single fork arm mount uses brass worm gears and improved motors to reduce backlash and improve tracking. Large handles help with setup, and manual clutches let you position the telescope when it is powered off. Etchings on the tripod legs help with balance and uniform height.
