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Celestron Schmidt-Cassegrain telescope SC 203/2032 EdgeHD 800 OTA
Celestron Schmidt-Cassegrain telescope SC 203/2032 EdgeHD 800 OTA
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£1,995.00
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Description
The Celestron EdgeHD telescope.
EdgeHD is the name for Celestron’s “aplanatic Schmidt Cassegrain telescope”. After over 50 years of success, Celestron has revolutionised the classic Schmidt Cassegrain telescope.
EdgeHD telescopes (“Edge High Definition") are true astrographs. This optical system delivers distortion-free, sharp images right to the edge of the visual field. This means that not only the coma without the optical axis is corrected, as is the case in currently available “coma-free” lens designs, but also field curvature.
Lots of optical systems are advertised as “astrographs”.
As desired, they display stars with pin-sharp clarity, but along a curved image plane. Photographing this using a camera results in a noticeable image field curvature which rises towards the edge of the image field, resulting in increasing star size and aberrations with larger sensors. The stars at the edge expand into small rings (“doughnuts”). As well as the coma, the Celestron Edge HD telescopes correct field curvature right up to the edge of the image. This also significantly improves resolution and magnitude limits in comparison to rival optical systems.
The XLT multi-coating helps to give the EdgeHD scopes a significant performance boost compared to similar systems on the market.
The Edge HD telescopes’ mechanisms and lens tube have been fully overhauled:
mirror clamps hold the primary mirror securely in any desired position without putting pressure on the optical elements. The image is stable, even during long exposure times.
Air vents behind the primary mirror provide fast air exchange so that the lens cools amazingly quickly. Thanks to an air filter system, dust is prevented from entering the lens tube.
This variant of the OTA comes equipped with a 3" Losmandy rail - suitable, for example, for use with the Celestron CGEM mount.
