Celestron 0.7x Focal Reducer for 11" EDGE HD

The new Celestron focal reducer for the 11-inch EdgeHD telescope uses a custom 5-element optical design engineered to maintain the flat field of the EdgeHD optical system. Unlike generic focal reducers, this unit offers very generous back focus, capable of accommodating various thick optical accessories intended for imaging. All EdgeHD focal reducers use high-refractive index, low-dispersion exotic lanthanum glass elements, which provide high-contrast images while minimizing chromatic aberration. All air-to-glass lens surfaces feature anti-reflective coating layers to maximize light transmission and color correction; additionally, the lens edges are blackened to minimize internal reflection and maximize image contrast. The metal housing containing the lenses was calculated and manufactured with CNC machinery using billet aluminum, achieving very precise spacing, alignment, and centering of the optical elements. Furthermore, the reducer comes with threaded metal caps to protect the lenses from dust and scratches. The 5-element optical system was specifically designed for the Edge HD 1100 telescope to keep the field flat and stars point-like to the edge of the photographic field. It maintains the same system back focus (105 mm) used at the F/10 focal ratio. Unlike generic reducers, the EdgeHD 0.7x provides generous back focus to accommodate accessories and a wide range of CCD cameras. It also allows the use of existing T-Adapters for EdgeHD and other Celestron imaging accessories. Using the reducer provides a gain of one full stop of aperture compared to the f/10 system: it cuts exposure time in half to capture objects of the same brightness. It also increases the field of view by 43%: it allows for wider field imaging, enabling the capture of large angular galaxies and nebulae in a single shot. It uses lanthanum and "rare earth" glass to obtain sharp, high-contrast images, minimizing chromatic aberration. All air-to-glass lens surfaces are multi-coated to offer maximum light transmission and perfect color correction, and feature blackened edges to minimize internal reflection and maximize contrast. The Edge HD 0.7x reducer screws directly onto the 3.3" rear cell thread of the Edge HD 1100 optical tube. The use of such a large diameter reduces mechanical vignetting and allows the telescope to be used with APS-C format CCD/CMOS sensors and off-axis guiders. Requires specific photographic adapter for EdgeHD 1100. Note: it is not optically compatible with the "standard" C11 or other SC or Cassegrain telescopes.

Main features

Celestron quality for a reliable and satisfying observation experience.

• Mount / thread: SCT/T2

Main technical specifications