Wavelength BlogCelestron CGEM II 700 7-Inch Maksutov-Cassegrain Telescope Optical Tube Assembly
- mfr: 91012
- SKU: 91012_FCA-VG
Used gear condition chart
| Condition | Cameras & photography gear | Lenses |
|---|---|---|
|
N
New
|
Product is brand new and was never used. Includes full manufacturer's warranty | |
|
LN
Like New
|
The product shows little or no signs of wear. | |
|
E+
Excellent Plus
|
May have slight wear but only visible under close inspection. | Barrel may show signs of light wear and/or usage. Lens glass is very clean.* |
|
E
Excellent
|
The product shows signs of light wear and/or usage. | Barrel may show signs of light wear and/or moderate usage. Lens glass may have marks or haze that should not affect picture quality. |
|
E-
Excellent Minus
|
Show signs of moderate wear and/or usage. LCD may be scratched. | Barrel shows signs of wear and/or moderate usage. Lens glass may have some dust/spots that should not affect picture quality. |
|
VG
Very Good
|
Appears well used and may include dings, scrapes/scratches, heavy brassing on body or LCD, but is in fully functional condition. | Barrel appears well used and may include dings, scrapes/scratches, heavy brassing. Lens glass may have marks or haze that should not affect picture quality. |
|
G
Good
|
Appears to have been used heavily, showing multiple dings, scrapes/scratches, cracks and heavy brassing, but functions correctly. | Barrel appears to have been used heavily, showing multiple dings, scrapes/scratches, heavy brassing. Lens glass may have fungus, excessive dust, and/or scratches that can affect picture quality. |
|
F
Fair
|
Item works with certain malfunctions. Read comment for exact details. | |
|
X
Poor
|
For parts only. Final Sale, Sold As-is. | |
|
OB
Open Box
|
The product retains the manufacturer’s warranty. It may have been displayed in our retail store, used occasionally for training, or returned without the original packaging, accessories, or manuals. Please inspect and test the product immediately. | |
Accessories
New - As packaged by manufacturer
For all other grades - Instruction books, caps, batteries, cases, hoods and straps are sold separately, except when specified.
All digital cameras are packed with Battery and charger except when stated otherwise.
* Used Lens Glass Disclaimer - Lenses, even when brand new from the factory, may have a slight amount of dust visible between the lens elements. This is an unavoidable result of the manufacturing process and will not affect image quality or resolution.
Available options:
-
Free standard shipping
*Orders placed before 3 PM EST Mon - Thur will ship the same day. Orders placed beyond these hours will be shipped the next business day. Exclusions apply. See shipping policy
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Free Local Pickup
Please call for store stock availability.
Requests made before 2:30 PM EST can be available for next-day pickup. Learn more
Additional options:
Product highlights
- 7.08-inch (180mm) aperture
- 2700mm focal length
- f/15 focal ratio
- Maksutov-Cassegrain optical design
- Up to 420x magnification
- StarBright XLT optical coatings on every surface
- 8x50 straight through finderscope
- 26mm super Plossl (1.25-inch) eyepiece
- High contrast views of planets and lunar landscapes
- Dovetail rail compatible with CGE mounts
Celestron CGEM II 700 7-Inch Maksutov-Cassegrain Telescope Optical Tube Assembly
The Celestron CGEM II 700 Maksutov-Cassegrain Telescope Optical Tube Assembly is a specialized instrument designed for detailed, high contrast views of smaller celestial objects like the planets. This Maksutov-Cassegrain optical tube provides unparalleled views of the planets and up-close views of the lunar surface, including craters and maria, and is also well suited for hunting smaller, fainter, deep sky objects such as globular clusters and planetary nebulae. Astronomers located in urban areas will appreciate the Mak’s ability to bring out more contrast in celestial objects.
Maksutov-Cassegrain Optical Design
The Mak is a catadioptric telescope, which means the optical design includes both a lens and a mirror. The light coming through a Mak passes through the corrector lens to the primary mirror and back to a spherical secondary mirror before it hits your eyepiece. Images are bright, sharp, and virtually free of chromatic aberration.
The Maksutov-Cassegrain’s optical design offers several unique benefits. Instead of a secondary mirror, the Mak features a 'secondary spot' of reflective coating applied directly to the inside of the corrector plate. Because of this, the telescope does not require frequent collimation like a Schmidt-Cassegrain. Also, the secondary spot is significantly smaller than a traditional Schmidt-Cassegrain secondary mirror, giving the Mak its signature high-contrast views.
StarBright XLT Technology
StarBright XLT is Celestron’s revolutionary optical coating system that outperforms any other coating in the commercial telescope market. There are three major components that make up our StarBright XLT high-transmission optical system design. It features a 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. The multi-layer anti-reflective coatings are made from precise layers of MgF2 (magnesium fluoride) and HfO2 (hafnium dioxide). Finally, the StarBright XLT uses high-transmission water white glass instead of soda lime glass for the corrector lens. Taken together, these three components make StarBright XLT one of the finest optical coatings available.
Questions
Shipping and Returns
Same Day Shipping
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Ratings and reviews
