Celestron 8" SCT (CG-5) Optical Tube Assembly
|
상품가격 상세보기
이벤트보기
|
- 상품상세정보
상품설명
The Celestron C8-A is the direct (but much improved) descendent of Celestronâs revolutionary C8 that transformed the hobby of astronomy when it was unveiled in 1970. This rugged aluminum optical tube is only 17 inches long and weighs just 13 pounds, making it easy to transport and set up. But the views are much more impressive than what youâd expect from such a compact instrument. The tube offers 2032 mm of focal length and a focal ratio of f/10, with the added versatility of Fastar (see below). It is equipped with Celestronâs patented StarBright® XLT optical coatings, which visibly increase contrast and light transmission for brighter deep space images and shorter exposure times. With StarBright XLT, youâll be able to discern subtle details while viewing the Moon and planets as well as faint galaxies and nebulae. The Celestron C8-A can be mounted on a multitude of computerized telescope mounts thanks to its CG-5 dovetail bar. This iconic optical tube provides the best balance of portability, handling ease, light gathering ability and price ever offered to the amateur astronomer.  Fastar Technology In 1997, CCDs were making a name for themselves in the astrophotography world, quickly supplanting traditional film photography thanks to their speed and convenience. This was the year that Celestron joined forces with the Santa Barbara Instruments Group (SBIG) to produce Fastar, a revolutionary add-on to Celestronâs hugely popular Schmidt-Cassegrain (SCT) optical system. With Fastar, the SCTâs secondary mirror can be removed and replaced with a field-flattening lens assembly (sold separately by third party manufacturers) so that a CCD camera can be used in the front of the telescope at the f/2 focus of the instrumentâs primary mirror. The potential of the Fastar system is staggering: exposures are 25 times shorter than if the camera was placed at the instrumentâs native f/10 focus. Imagers can capture galaxies and nebulae with exposures of just 30 seconds. For more information about our Fastar technology, visit here.  StarBright XLT coatings StarBright XLT is Celestronâs revolutionary optical coating system. It consistently outperforms all other coatings in the commercial telescope market. There are three major components that make up our StarBright XLT high-transmission optical system design: Unique enhanced multi-layer mirror coatings made from precise layers of aluminum, SiO2 (quartz), TiO2 (titanium dioxide), and SiO2 (silicon dioxide). Reflectivity is fairly flat across the spectrum, optimizing it for both imaging and visual observing. Multi-layer anti-reflective coatings made from precise layers of MgF2 (magnesium fluoride) and HfO2 (hafnium dioxide). Hafniumâa rare element that costs nearly $2,000 per kilogramâgives us a wider band pass than the titanium used in competing coatings. High-transmission water white glass is used instead of soda lime glass for the corrector lens. Water white glass transmits about 90.5% of light without anti-reflective coatings; thatâs 3.5% better than uncoated soda lime glass. When water white glass is used in conjunction with StarBright XLTâs anti-reflective coatings, the average transmission reaches an astonishing 97.4. These three components make StarBright XLT one of the finest coatings available. For more information about our patented StarBright XLT coatings, visit here.
The Celestron C8-A is the direct (but much improved) descendent of Celestronâs revolutionary C8 that transformed the hobby of astronomy when it was unveiled in 1970. This rugged aluminum optical tube is only 17 inches long and weighs just 13 pounds, making it easy to transport and set up. But the views are much more impressive than what youâd expect from such a compact instrument. The tube offers 2032 mm of focal length and a focal ratio of f/10, with the added versatility of Fastar (see below). It is equipped with Celestronâs patented StarBright® XLT optical coatings, which visibly increase contrast and light transmission for brighter deep space images and shorter exposure times. With StarBright XLT, youâll be able to discern subtle details while viewing the Moon and planets as well as faint galaxies and nebulae. The Celestron C8-A can be mounted on a multitude of computerized telescope mounts thanks to its CG-5 dovetail bar. This iconic optical tube provides the best balance of portability, handling ease, light gathering ability and price ever offered to the amateur astronomer.  Fastar Technology In 1997, CCDs were making a name for themselves in the astrophotography world, quickly supplanting traditional film photography thanks to their speed and convenience. This was the year that Celestron joined forces with the Santa Barbara Instruments Group (SBIG) to produce Fastar, a revolutionary add-on to Celestronâs hugely popular Schmidt-Cassegrain (SCT) optical system. With Fastar, the SCTâs secondary mirror can be removed and replaced with a field-flattening lens assembly (sold separately by third party manufacturers) so that a CCD camera can be used in the front of the telescope at the f/2 focus of the instrumentâs primary mirror. The potential of the Fastar system is staggering: exposures are 25 times shorter than if the camera was placed at the instrumentâs native f/10 focus. Imagers can capture galaxies and nebulae with exposures of just 30 seconds. For more information about our Fastar technology, visit here.  StarBright XLT coatings StarBright XLT is Celestronâs revolutionary optical coating system. It consistently outperforms all other coatings in the commercial telescope market. There are three major components that make up our StarBright XLT high-transmission optical system design: Unique enhanced multi-layer mirror coatings made from precise layers of aluminum, SiO2 (quartz), TiO2 (titanium dioxide), and SiO2 (silicon dioxide). Reflectivity is fairly flat across the spectrum, optimizing it for both imaging and visual observing. Multi-layer anti-reflective coatings made from precise layers of MgF2 (magnesium fluoride) and HfO2 (hafnium dioxide). Hafniumâa rare element that costs nearly $2,000 per kilogramâgives us a wider band pass than the titanium used in competing coatings. High-transmission water white glass is used instead of soda lime glass for the corrector lens. Water white glass transmits about 90.5% of light without anti-reflective coatings; thatâs 3.5% better than uncoated soda lime glass. When water white glass is used in conjunction with StarBright XLTâs anti-reflective coatings, the average transmission reaches an astonishing 97.4. These three components make StarBright XLT one of the finest coatings available. For more information about our patented StarBright XLT coatings, visit here.
2019-09-02 23:51:27