엑소스카이는 대한민국에서 셀레스트론(Celestron) 상표권을 소유하고 있습니다.
셀레스트론 상표권을 엑소스카이로부터 허가없이 사용하면 민.형사상의 책임이 따름을 고지합니다.
엑소스카이는 셀레스트론사의 한국내 총판으로 정식 수입 통관된 정품(위 정품 스티커를 확인해 주세요.)만을 취급합니다. 밀반입 되거나 다른 경로로 수입된 제품은 A/S 및 기술지원을 받을 수 없음을 알려 드립니다. 일부 중국산 짝퉁 제품도 있으니 구입시 유의해 주세요. 셀레스트론사 제품은 엑소스카이를 통해 안전하게 구매하시길 바랍니다.
본 제품을 구입하시면 영문메뉴얼을 완역한 한글메뉴얼을 제공해 드립니다. 대충 만든 간편 메뉴얼이 아닙니다. 엑소스카이에서 번역한 만큼 대충이란 없습니다. 제대로 완역한 메뉴얼이라면 초보자에게 절대적으로 필요합니다.
셀레스트론사의 제품은 Engineered in the USA로 미국 기술자들이 의해 디자인 되었으며 엄격한 품질관리를 통해 제작됩니다. 이는 타사 제품과는 달리 품질 관리가 뛰어나 고장이나 파손이 거의 없을 의미합니다.
셀레스트론은 우주를 사랑하는 여러분과 함께합니다. 당신의 우주여행이 지금 시작 됩니다!
CGEM II 925 HD combines Celestron's newly redesigned CGEM II computerized equatorial mount with its acclaimed EdgeHD optical system. With over 9 inches of aperture and our premium StarBright XLT coatings, the CGEM II 925 HD gives you over 1000 times the light gathering power than the unaided eye. Designed to give diffraction limited performance and offer more resolution than the 800 with less weight than the 1100, the CGEM II 925 HD is a premier astroimaging telescope.
OPTICAL TUBE INFO:
See the Universe in HD
EdgeHD is an aplanatic, flat field Schmidt-Cassegrain telescope that produces aberration-free images across a wide visual and photographic field of view. The optical system was designed to reduce more than just off-axis star coma; it also provides an astrograph-quality flat focal plane all the way to the edge of the field of view.
True Astrograph Quality
Many optical designs that advertise themselves as "astrographs" actually only produce pinpoint stars across a curved focal plane. While this may be acceptable for some visual observing, stars will appear out of focus at the edge when used with the flat chip sensor of a digital camera. EdgeHD optics produce a focal plane more than three-times flatter than a standard Schmidt-Cassegrain telescope and dramatically flatter than competing coma-free designs. This guarantees you visibly sharp stars across some of the largest CCD chips available today.
True Astrograph Quality
Many optical designs advertise themselves as “astrographs,” but only produce pinpoint stars across a curved focal plane. Even when focused sharply in the center of the field of view, this curved plane cannot bring stars at the edges into focus. The wider the field of view, the more pronounced this defect becomes. This may be acceptable for some visual observing, but when a curved plane is paired with the flat sensor of a digital camera, stars become noticeably out of focus at the edges.
EdgeHD optics produce a focal plane more than three times flatter than a standard Schmidt-Cassegrain telescope and dramatically flatter than other competing coma-free designs, guaranteeing you visibly sharp stars all the way across the imaging sensor.
A curved focal plane cannot produce consistent results on a flat CCD chip. Stars will appear out of focus at the edges.
A DIFFERENCE YOU CAN SEE
Compare the two images of M3 below. The first was taken with a competing coma-free optical design, the second with EdgeHD. Both images were taken with the same 35 mm chip (42 mm diameter focal plane) camera under the same conditions.
When focused on-axis, both images appear to be sharp in the center. But in the first image, as you examine the stars closer and closer to the edge, the stars become larger and less focused. Finally, at the very corners, the stars are so defocused that they appear as rings instead of pinpoints.
Now look at the second image. As you move from the center outward, the stars retain their focus from edge to edge, appearing as crisp, solid points of light.
Fig. 1: The competing coma-free design, when focused on the axis, shows sharp stars in the center of the image, but dramatically out-of-focus stars (rings or donuts) at the edges.
Fig. 2: EdgeHD produces a consistent, sharp focus across the entire FOV.
IMPROVED PERFORMANCE FOR BRIGHTER, MORE DETAILED IMAGES
Superior edge performance not only creates rounder, more pleasing stars, but actually improves the resolution and limiting magnitude compared to telescopes of equal aperture.
Celestron’s high definition optics let you resolve smaller spot sizes all the way to the outer edge, revealing finer detail and greater contrast. Compare the two cropped images below, both taken with a 37 mm chip (52 mm diameter focal plane) camera.
Fig. 1 (left): The off-axis coma inherent in many optical designs (such as the SCT shown above) distorts star images and compromises resolution.
Fig. 2 (right): EdgeHD focuses sharply across the entire FOV, revealing fine detail lost with other systems.
What’s more, EdgeHD optics give you smaller, more concentrated stars so you can see fainter magnitudes than with other equally-sized telescopes. Poor edge quality can spread out starlight so much that the brightness of a star appears the same as the sky background, making it undetectable to your eye or camera. With EdgeHD optics, you can capture the faintest of galaxies all the way to the corner of your full-frame camera chip. Compare the two cropped images below, both taken with a 37 mm chip (52 mm diameter focal plane) camera.
Fig. 1 (left): In telescopes that exhibit off-axis coma, faint starlight can go unnoticed at the edge of the field of view.
Fig. 2 (right): EdgeHD optics resolve faint detail missed in telescopes of equal aperture.
All EdgeHD optical tubes also feature Celestron’s StarBright XLT coating system on all mirror and lens surfaces. When added to the EdgeHD optical system, StarBright XLT provides maximum light throughput across the widest visual and photographic spectrum.
MECHANICAL FEATURES
The EdgeHD tube features an innovative mechanical design to ensure you get the most from your optics each and every night.
Mirror support
Flexible tension clutches hold the primary mirror in place and reduce image shift. The flexible rods hold the mirror in place without putting any force or pressure on the mirror assembly, keeping your target centered in the eyepiece or chip.
Tube vents
Cooling vents located on the rear cell allow hot air to be released from behind the primary mirror. Each vent has an integrated micromesh filter guaranteed to let warm air out without letting dust in.
Fastar versatility
EdgeHD is the most versatile imaging telescope available today. At its native f/10, you can achieve the image scale necessary to capture the smallest of deep-sky objects. To increase your field of view without sacrificing performance, add the optional EdgeHD reducer lens. Each one is custom-made for your size EdgeHD optical tube and brings your focal ratio down to f/7. A Barlow lens provides additional magnification for high-resolution planetary, lunar, and solar imaging. And, of course, all EdgeHD optical tubes are Fastar-compatible for ultra-fast f/2 wide field imaging. Each EdgeHD tube is fitted with a removable secondary mirror and is opto-mechanically aligned on a laser bench to ensure it is axially symmetric in any configuration.
Easy collimation
Guarantee ideal performance every time. Edge HD’s precision-machined mechanics and a spherical secondary mirror make collimation simple and accurate.
EDGEHD WHITEPAPER
Want the full story behind EdgeHD optics? Celestron’s Product Development team has released a whitepaper outlining the development of EdgeHD, the manufacturing and QA process, and how to get the most out of your system. It also includes cross-sections of the EdgeHD series, comparative spot diagrams for the EdgeHD and competing “coma-free” Schmidt-Cassegrain designs, a table with specifications for visual and imaging, and graphics showing how to place sensors at the optimum back-focus distance for astroimaging.
Improved Performance
Superior edge performance not only creates rounder, more pleasing stars, but actually improves the resolution and limiting magnitude when compared to telescopes of equal aperture. With Celestron’s StarBright XLT optical coatings on every surface, EdgeHD optics gives you maximum light throughput across the widest visual and photographic spectrum.
Mechanical Features
In addition to EdgeHD’s optimized optical design, the telescope tube has been redesigned to make sure you get the most from your optics each and every night.
Mirror clutches - Flexible tension clutches hold the mirror in place and reduce image shift when taking long exposure astro-images. Once focused, the flexible rods allow the mirror to be held in place without putting any force or pressure on the mirror assembly, keeping the image centered in the eyepiece (or on the sensor).
Tube vents - Cooling vents located on the rear cell allow hot air to be released from behind the primary mirror. Each vent has an integrated 50-mesh filter guaranteed to let warm air out without letting dust in.
Fastar versatility - EdgeHD is the most versatile imaging telescope available today. At its native f/10, you can achieve the image scale necessary to capture the smallest of deep sky objects. A Barlow gives you added power for high-resolution planetary, lunar and solar imaging. All EdgeHD optical tubes are Fastar-compatible, allowing the secondary mirror to be removed and replaced with a third party lens accessory for ultra-fast f/2 wide field imaging.
Individually Tested
Every EdgeHD that ships has been tested not only for the surface quality of each optical component, but also with a camera and artificial star to ensure the imaging system meets our rigid quality assurance. This “final acceptance test” confirms the EdgeHD will perform in the field and deliver high-quality astroimages.
MOUNT INFO:
A fresh update to the venerable CGEM mount, the CGEM II has a fresh, attractive, bold appearance and is capable of carrying Celestron’s higher-end SCT optical tubes (up to 11") securely and vibration free, which is ideal for both imaging and visual observing. Capable of holding 40 lbs. of payload and slewing at 5° per second, you will be able to instantly point to any of the celestial objects in the database.
ERGONOMIC DESIGN
CGEM II was designed to be ergonomically friendly with large Altitude and Azimuth adjustment knobs for quick and easy polar alignment adjustment. The internal RA and DEC motor wiring provides a clean look and an easy and trouble free set up.
INNOVATION
The CGEM II series features Celestron’s innovative Polar alignment procedure called All-Star™. All-Star allows users to choose any bright star, while the software calculates and assists with polar alignment. Another great feature of the CGEM II sure to please astroimagers, is the Permanent Periodic Error Correction (PEC) which will allow users to train out the worm gears periodic errors, while the mount retains the PEC recordings.
PERFORMANCE
For objects near the Meridian (imaginary line passing from North to South), the CGEM II will track well past the Meridian for uninterrupted imaging through the most ideal part of the sky. The CGEM II mount has a robust database with over 40,000 objects, 100 user defined programmable objects and enhanced information on over 200 objects. Celestron's CGEM II mount is the perfect fit between the Advanced Series and CGE Series. Offering the portability of the Advanced Series and the precision of the CGE.
✔ 9.25” EdgeHD optics
✔ CGEM II computerized equatorial mount
✔ Celestron’s premium StarBright XLT coatings provide maximum light transmission
✔ A 9x50 finderscope, 2” mirror diagonal for more comfortable viewing, and wide-angle 23 mm Luminos 2" eyepiece are all included