See the Universe in HDEdgeHD is an aplanatic flat field Schmidt-Cassegrain telescope that produces aberration-free images across a wide visual and photographic field of view. The optical system was designed to reduce more than just off-axis star coma; it also provides an astrograph-quality flat focal plane all the way to the edge of the field of view. True Astrograph QualityMany optical designs that advertise themselves as inastrographsin actually only produce pinpoint stars across a curved focal plane. While this may be acceptable for some visual observing stars will appear out of focus at the edge when used with the flat chip sensor of a digital camera. EdgeHD optics produce a focal plane more than three-times flatter than a standard Schmidt-Cassegrain telescope and dramatically flatter than competing coma-free designs. This guarantees you visibly sharp stars across some of the largest CCD chips available today. Learn more about EdgeHD technology. Improved PerformanceSuperior edge performance not only creates rounder more pleasing stars but actually improves the resolution and limiting magnitude when compared to telescopes of equal aperture. With Celestrons StarBright XLT optical coatings on every surface EdgeHD optics gives you maximum light throughput across the widest visual and photographic spectrum. Mechanical FeaturesIn addition to EdgeHDs optimized optical design the telescope tube has been redesigned to make sure you get the most from your optics each and every night. Mirror clutches - Flexible tension clutches hold the mirror in place and reduce image shift when taking long exposure astro-images. Once focused the flexible rods allow the mirror to be held in place without putting any force or pressure on the mirror assembly keeping the image centered in the eyepiece (or on the sensor). Tube vents - Cooling vents located on the rear cell allow hot air to be released from behind the primary mirror. Each vent has an integrated 95-micron micromesh filter guaranteed to let warm air out without letting dust in. Fastar versatility - EdgeHD is the most versatile imaging telescope available today. At its native f/10 you can achieve the image scale necessary to capture the smallest of deep sky objects. Add the optional reducer lenscustom-designed for your size EdgeHD tubeand you can increase your field of view without sacrificing optical performance. A Barlow gives you added power for high-resolution planetary lunar and solar imaging. All EdgeHD optical tubes are Fastar-compatible allowing the secondary mirror to be removed and replaced with a third party lens accessory for ultra-fast f/2 wide field imaging. Individually TestedEvery EdgeHD that ships has been tested not only for the surface quality of each optical component but also with a camera and artificial star to ensure the imaging system meets our rigid quality assurance. This final acceptance test confirms the EdgeHD will perform in the field and deliver high-quality astroimages.