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Celestron - C8-SGT Advanced Series with STARBRIGHT XLT Coatings
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$ 1514.00
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Click here for recommended accessories |
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Celestron’s C8 has been a best-selling optical system for decades. Combining a repuation for
optical excellence with lightweight portability and great value, the C8-SGT is the perfect choice
if you’re looking for an advanced computerized telescope or want to upgrade to a larger aperture
telescope.
An adjustable counterweight makes it easy to point, balance and use. The C8-S optical system
comes with StarBright® coatings and its large aperture offers light gathering power 843 times
that of the human eye. Included are setting circles on both axes, slow-motion controls and
latitude scale. An optional polar alignment scope for quick alignment is available.
Mounted on the Advanced GT Series computerized mount, this telescope
has some high performance software features including an autoguider port for astrophotography.
Operated by our proven NexStar® computer control technology the telescope has a 40,000+ object
database with 400 user-definable objects and expanded information on over 200 objects. Custom
database lists of all the most famous deep-sky objects by name and catalog number; the most
beautiful double, triple and quadruple stars; variable star; solar systems; objects and
asterisms.
Using the RS-232 communication port on the hand control, you can control the telescope via a
personal computer and our new flash upgradeable hand controls allow you to update your
telescope’s operationg software via the internet.
CG-5 Mount - Precision engineered for stability.
Our new German Equatorial mount has precision worm gears on both axes for extremely smooth
stability. The key element that makes this system the most stable in its class is the NEW
heavy-duty tripod with larger and more substantial legs that offer excellent damping
characteristics for more stable views. The CG-5 also has a convenient latitude scale for easier
alignment and an optional polar finder scope for the ultimate in precision alignments.
Celestron has brought its renowned StarBright technology to an even higher level of light
transmission with the introduction of our new optional StarBright XLT High Performance Optical
Coating System.
StarBright XLT Optical System Design - You’ll See The Light.
One of the most important factors in the evaluation of a Schmidt-Cassegrain telescope’s optical
system performance is its transmission - the percentage of incoming light that reaches the focal
plane. The design of the XLT System accomplishes two crucial objectives: Develop a coating system
that is optimized for visual use and for CCD/Photographic imaging.
The StarBright XLT System - What Makes It Different Makes It Better
There are three major components that make up our StarBright XLT high transmission optical system
design:
1. Unique enhanced multi-layer mirror coatings
Our mirror coatings are made from precise layers of Aluminum (Al), SiO2 (quartz), TiO2 (Titanium
Dioxide), and Si02. Reflectivity is fairly flat across the spectrum, optimizing it for both CCD
imaging and visual use. Click here to see a plot of the reflectivity of XLT’s Mirror Coatings.
2. Multi-layer anti-reflective coatings
Made from precise layers of MgF2 (Magnesium Fluoride), and HfO2 (Hafnium Dioxide) A rare element
costing nearly $2000 per kilogram, Hafnium gives us a wider band pass than Titanium, used in
competing coatings. Click here to see a plot of XLT’s corrector transmission.
3. High Transmission Water White glass
Celestron Schmidt-Cassegrain optical systems with optional StarBright XLT coatings use Water
White glass instead of Soda Lime glass for the corrector lens. Water White glass transmits about
90.5% without anti-reflective coatings. That is 3.5% better transmission than uncoated Soda Lime
glass. When Water White glass is used in conjunction with StarBright XLT’s anti-reflective
coatings, the average transmission reaches 97.4% - an 8% improvement! Click here to see a plot of
water white glass versus soda lime.*
These three components of our StarBright XLT coatings result in one of the finest coatings
available. The peak transmission for the systems is 89% at 520 nm. The overall system
transmission is 83.5% averaged over the spectrum from 400 to 750 nm.
CG-5 Computerized — GoTo convenience and GPS compatibility for precision accuracy
We are proud to offer a computerized GoTo version of Celestron’s sturdy CG-5
mount. Couple this solid mount with the included computerized control system to utilize many of
the same functions and features — like the NexStarcomputer control system and an Autoguider port
for long exposure deep sky astrophotography — as Celestron’s most advanced GoTo telescopes.
GoTo models are also upgradeable to GPS with the optional CN16 GPS Accessory (#93966)
allowing your telescope to pinpoint your position on the earth, the date and
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