![]() Tube vents - Cooling vents located on the rear cell allow hot air to be released from behind the primary mirror.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). Mirror clutches - Flexible tension clutches hold the mirror in place and reduce image shift when taking long exposure astro-images.In addition to EdgeHD’s optimized optical design, the telescope tube has been redesigned to make sure you get the most from your optics each and every night. ![]() With Celestron’s StarBright XLT optical coatings on every surface, EdgeHD optics gives you maximum light throughput across the widest visual and photographic spectrum. Superior edge performance not only creates rounder, more pleasing stars, but actually improves the resolution and limiting magnitude when compared to telescopes of equal aperture. This guarantees you visibly sharp stars across some of the largest CCD chips available today. 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. 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. Many optical designs that advertise themselves as "astrographs" actually only produce pinpoint stars across a curved focal plane. 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. EdgeHD is an aplanatic, flat field Schmidt-Cassegrain telescope that produces aberration-free images across a wide visual and photographic field of view.
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