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Reducer / Correctors

ScopeTronix Field Doubler

   A ScopeTronix exclusive, this field doubler attaches to the back of your ETX-90/105/125 or NexStar 4 and effectively shortens the focal ratio of your telescope to f/7. This system will provide wider fields of view for your CCD imager or webcam while also reducing your exposure times. Now you can image more of the Moon or that large star cluster or galaxy. The Field Doubler is designed to allow for a wider field imaging; it is not designed for visual use and the scope will not reach focus if a diagonal is inserted into it.

Please note: For use with only the ETX 90/105/125 and NexStar 4.

Meade f/6.3 and f/3.3 Focal Reducer/Field Flattener
For CCD, photographic, and visual applications.

   f/6.3 Focal Reducer/Field Flattener: An important advancement in high-resolution focal reduction systems, the Meade 4-element, multi-coated f/6.3 Focal Reducer threads on to the rear cell of any Meade LX-series mirror-lens telescope or to other Schmidt-Cassegrain telescope brands (followed by the Off-Axis Guider, shown, or T-Adapter) and reduces the telescope's focal ratio by a factor of 0.63: f/10 telescopes are converted to f/6.3; f/6.3 telescopes are converted to f/4. Simultaneously, the 41mm-diameter lens system helps to flatten the field, significantly improving edge-of-field corrections. The f/6.3 Focal Reducer enables a reduction of photographic exposure times by about 50%, while producing an actual field diameter of 1.5" at the film plane.

f/3.3 CCD Focal Reducer with Variable T-Adapter

   f/3.3 CCD Focal Reducer/Field Flattener: The revolutionary Meade f/3.3 CCD Focal Reducer converts the optical systems of f/10 Schmidt-Cassegrain telescopes to f/3.3 or the f/6.3 Schmidt-Cassegrains to f/2, for ultrafast CCD imaging, and with increased edge of field resolution and color correction. Mounted in its threaded cell, the f/3.3 Focal Reducer attaches to the rear cells of all Meade LX-Series Schmidt-Cassegrains and other other Schmidt-Cassegrain brands as well and reduces CCD exposure times by up to 80%. The 3-element, 41mm clear aperture optics are multi-coated to maximize light transmission. Included with each f/3.3 CCD Focal Reducer is a Variable T-Adapter that allows a range of f/ratios between f/3 and f/5 on f/10 SCT's and between f/1.9 and f/3.2 on F/6.3 SCT's. The f/3.3 CCD Focal Reducer may be used with CCD imagers of any brand and chip dimensions and produces spectacular results. Note, however, that the f/3.3 unit is not recommended for use in either visual or photographic imaging applications.

Celestron f/6.3 Focal Reducer/Corrector

   This combination focal reducer and field corrector lens accessory works with all Celestron 5", 8", 9.25", 11", and 14" Schmidt-Cassegrain telescopes. This clever accessory makes it possible to have a dual focal ratio instrument, without sacrificing image quality. The Reducer/Corrector is f/6.3 for C5, C8, C9.25 and C11 telescopes and f/7 for the C14 telescope. It offers wide fields of view with any Schmidt-Cassegrain telescope. Used for astrophotography, it reduces exposure time by a factor of 3.