| This f/3.3 CCD focal reducer converts an f/10 Schmidt-Cassegrain telescope to a fast f/3.3 system and a native f/6.3 to an f/2. An f/8 Ritchey-Chrétien converts to an f/2.64 system. This yields a much 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 RCX400 Ritchey-Chrétien, 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 and an additional f/1.9 or f/3.2 focal ratio with an f/6.3, plus an additional f/2.4 or f/4 focal ratio with an f/8 Ritchey-Chrétien. You can use the f/3.3 CCD focal reducer with CCD imagers of any brand and chip dimensions to produce spectacular wide-field results. The f/3.3 reducer is for CCD use only, and cannot be used for visual observing or 35mm/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.
| 
Printer friendly version
Email page link to a friend
Do you have a question about this product?
