Celestron EdgeHD 11" OTA - CGE Dovetail

EdgeHD Optics: A 0.42 Arc Second, Flat-Field Aplanatic System

The core of the EdgeHD 11" is its aplanatic, flat-field Schmidt-Cassegrain optical system, designed to reduce more than off-axis star coma: it also gives an astrograph-quality flat focal plane all the way to the edge of the field. Many designs sold as astrographs only form pinpoint stars on a curved focal plane, so stars look out of focus at the edge of a flat camera sensor; EdgeHD's focal plane is more than three times flatter than a standard Schmidt-Cassegrain.

Dawes resolution is 0.42 arc seconds. Superior edge performance not only creates rounder stars but improves resolution and limiting magnitude compared with telescopes of equal aperture, and every EdgeHD should resolve double stars to the Dawes limit, show subtle shadings in Jupiter's belts and reveal the Cassini Division in Saturn's rings. Every optical surface is treated with Celestron's premium StarBright XLT coatings, for maximum light throughput across the visual and photographic spectrum.

11-Inch Aperture: 1593x Light Gathering and 14.7 Limiting Magnitude

The 279.4mm (11") primary mirror gathers 1593 times as much light as the unaided human eye. The limiting stellar magnitude is 14.7.

Imaging Versatility: Native f/10, Reducer and Fastar f/2

At its native f/10, you get the image scale to capture the smallest deep-sky objects. The optional five-element 0.7x reducer lens for the EdgeHD 1100 (#94241) widens the field without sacrificing optical performance and attaches to the 3.290"x16 tpi rear thread, and a Barlow adds power for high-resolution planetary, lunar and solar imaging.

For the ultimate in wide-field, short-exposure imaging, all EdgeHD optical tubes are Fastar-compatible. The secondary mirror can be removed and replaced with a third-party lens accessory for ultra-fast f/2 wide-field imaging.

Astrograph-Grade Mechanics: Mirror Clutches and Cooling Vents

Celestron redesigned the mechanical systems of the EdgeHD to meet the demands of long-exposure imaging.

• Flexible Tension Clutches: Flexible tension clutches hold the mirror in place and reduce image shift during long exposures. Once focused, you tighten the two mirror lock knobs, and the flexible rods hold the mirror without putting force on the mirror assembly. Loosen them before you turn the focus knob again.
• Integrated Cooling Vents: The rear cell features vents with integrated 50-mesh filters that let warm air out from behind the primary mirror without letting dust in.
• CGE Dovetail Bar: The tube comes on a CGE dovetail bar.

A Superb Visual Instrument: 660x Useful Magnification

EdgeHD gives aberration-free images across a wide visual field too. On deep-sky objects, viewed with a high-quality eyepiece, star images appear sharp and well defined to the edge of the field. The highest useful magnification is 660x.

The telescope comes ready for visual use out of the box. It includes a 2" star diagonal with a 1.25" adapter for eyepiece flexibility and a 23mm eyepiece that provides 122x magnification. The included 9x50 finderscope makes locating targets straightforward, whether you are star-hopping manually or using a GoTo mount.