Celestron 0.7x Focal Reducer for 14" EDGE HD

The new Celestron focal reducer for the 14-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 reducer provides very generous back focus, capable of accommodating various thick optical accessories for imaging. All Edge HD focal reducers use high-refractive-index, low-dispersion exotic lanthanum glass elements, which offer high-contrast images while minimizing chromatic aberration. All air-to-glass lens surfaces are treated with anti-reflective coatings to maximize light transmission and color correction; furthermore, the lens edges are blackened to minimize internal reflection and maximize image contrast. The metal housing containing the lenses was calculated and manufactured using CNC machinery from aluminum bar stock, achieving very precise spacing, alignment, and centering of the optical elements. The reducer is also supplied with threaded metal caps to protect the lenses from dust and scratches. The 5-element optical system was specifically designed for the Edge HD 1400 telescope to maintain a flat field and point-like stars 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 reducer provides generous back focus to accommodate accessories and a wide range of CCD cameras. It also allows for the use of existing T-Adapters for EdgeHD and other Celestron imaging accessories. Using the reducer allows for a full stop of aperture gain compared to the f/10 system: It reduces exposure time by half to capture objects of the same brightness. It also increases the field of view by 43%: It allows for capturing wider-field images, enabling the imaging of galaxies and nebulae with large angular extension in a single shot. It uses lanthanum and "rare earth" glass to obtain sharp, high-contrast images while 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 into the rear 3.3" threaded cell of the Edge HD 1400 optical tube. Using 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 a specific photographic adapter for EdgeHD 1400. Note: not optically compatible with the "standard" C14 or other SC or Cassegrain telescopes.

Key features

Celestron quality for a reliable and satisfying observation experience.

• Mount / thread: SCT/T2

Main technical specifications