| This f/3.3 CCD focal reducer converts an f/10 Schmidt-Cassegrain telescope to a fast f/3.3 system for imaging with small chip CCD cameras and DSI-type cameras. It is not suitable for DSLR or large chip (35mm-size) CCD cameras. This focal reduction yields a wider field for imaging large deep space objects and reduces CCD exposure times by up to 80% for ultrafast imaging. It also yields increased edge of field resolution and color correction.
Its 3-element, 41mm clear-aperture optics are multicoated to maximize light transmission. Mounted in its threaded cell, the f/3.3 reducer attaches to the rear cell of any Meade LX-Series Schmidt-Cassegrain or ACF scope, or to the rear cell of any Celestron 5" through 14" Schmidt-Cassegrain. Because of the reducer’s very short back focus, the CCD camera attaches directly to the reducer using the T-threads on the reducer. Adding a color filter wheel between the reducer and the camera will usually add enough distance to prevent the camera from reaching focus.
Included with each f/3.3 CCD focal reducer is a variable T-adapter. This allows the choice of an additional f/3 or f/5 focal ratio with an f/10 SCT or ACF scope.
The f/3.3 reducer is for small chip CCD and DSI-type camera use only, and cannot be used for visual observing or 35mm/DSLR/large chip CCD/medium format photographic imaging.
The f/3.3 CCD focal reducer comes with full instructions. It has plastic dust caps for both sides of the lens assembly and stores in a protective bolt-type plastic case. A rubber grip ring on the body allows for easy installation of the reducer on your scope, even when you are wearing gloves.
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