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Celestron C9.25 Edge-HD
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See the Universe in HD
EdgeHD 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 Quality
Many optical designs that advertise themselves as "astrographs" 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.
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. With Celestron’s StarBright XLT optical coatings on every surface, EdgeHD optics gives you maximum light throughput across the widest visual and photographic spectrum.
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.
Every 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.
|Type of build||EdgeHD-Cassegrain|
|Focal length (mm)||2350|
|Aperture ratio (f/)||10|
|Light gathering capacity||1127|
|Max. useful magnification||470|
|Tube weight (kg)||9,5|
|Tube length (mm)||559|
|Secondary mirror diameter (mm)||85|
|Secondary mirror obstruction||36|
|Ventilation for central mirror||yes|
|Type of build||SC thread|
|Connection ( to eyepiece)||2|
|Mounting type||no mount|
|Type of build||OTA|
|2'' eyepieces||Axiom LX 23mm|
|Deviating optics||2", 90° star diagonal|
|Eyepiece adaptor||1,25" & 2"|
Area of application
|Moon & Planets||yes|
|Nebulae & galaxies||yes|
|Astrophotography||yes (very good)|
|Sun||no (Only with appropriate Sun filter)|