Celestron C11-A XLT (CGE) Optical Tube Assembly

Celestron C11-A XLT 11" f/10 Schmidt-Cassegrain Telescope (OTA Only, CGE Dovetail)

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Your Price: CAD4,938.10

Retail Price:CAD5,185.01

Your Savings:CAD246.91(5%)

Part Number: 91036-XLT

Availability: Usually ships in 5-7 business days

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Description

Product Highlights

11" Schmidt-Cassegrain OTA
2800mm Focal Length, f/10 Focal Ratio
StarBright XLT Optical Coatings
40mm Eyepiece, 90° Diagonal
9x50 Finderscope
CGE (Losmandy) Dovetail Plate
OTA Only; Mount and Tripod Required

Outfitted with an over-sized aperture, long effective focal length, and their proprietary StarBright XLT optical coatings, the Celestron C11-A XLT 11" f/10 Schmidt-Cassegrain Telescope provides power and portability. The coating system consists of anti-reflection coatings on the corrector plate, highly reflective index mirror coatings, and low-absorption/high-transmission glass components to ensure that the maximum amount of light is gathered and transmitted to the user's eye. This system ensures bright and clear high-contrast images with accurate color rendition across the entire visual spectrum without visible distortion at the edges. Celestron includes a standard 1.25" visual back to accept eyepieces and accessories such as the 40mm eyepiece and 90° diagonal supplied with the optical tube assembly (OTA). This OTA is offered here without a mount or tripod for users who already have a support system - just ensure the mount's payload capacity exceeds 27.5 pounds to safely carry the weight, and has a Losmandy-style saddle to match the OTA's CGE mounting plate.

Optical Tube

11" (279.4mm) aperture
f/10 focal ratio
2800mm effective focal length
Schmidt-Cassegrain design optical path
StarBright XLT optical coatings
Resolution: 0.5 arcsec (Rayleigh); 0.42 arcsec (Dawes)
Secondary mirror obstruction: 3.75" (95 mm); 34% by diameter; 12% by area

StarBright XLT System

Maximizes light transmission through optical path
Improves color rendition, contrast, sharpness, resolution, and brightness
Broad-band system provides flat wavelength transmission across the entire visual spectrum
Multi-layer mirror coatings with layers of aluminum, SiO2 (quartz), and TiO2 (titanium dioxide)
Multi-layer anti-reflective corrector plate coatings with layers of MgF2 (magnesium fluoride) and HfO2 (hafnium dioxide). Hafnium has a wider band-pass than the commonly used titanium
High-transmission water white glass corrector plate limits light loss due to internal absorption

Mounting

Optical tube only - Mount and tripod required for proper use
Supplied with CGE dovetail plate that is compatible with Losmandy-style saddles
Mount must have a payload capacity of over 27.5 pounds to safely support the OTA

Included Accessories

Standard threads for SCT optical tubes
1.25" holder accepts 1.25" eyepieces and accessories

1.25" diameter barrel
Accepts most 1.25" astronomical filters
40mm focal length produces 70x magnification

1.25" diameter barrel
90° angle places head in comfortable viewing position when scope is aimed at or near the zenith
Star diagonal corrects view horizontally, but not vertically

9x magnification
50mm aperture
Mounting bracket included

Specifications

Optical Design	Schmidt-Cassegrain
Aperture	27.9 cm
Focal Length	2800 mm
Focal Ratio	f/10
Eyepiece Barrel Diameter	1.25"
Diagonal	90° star 1.25" barrel
Finderscope	9x50 mm
Tripod	None
Mount Type	CGE dovetail plate
Power Source	None
Optical Tube Length	24.0" / 61.0 cm
Weight	27.5 lbs / 12.5 kg

Packaging Info
Package Weight	42.0 lb
Box Dimensions (LxWxH)	30.0 x 18.0 x 17.0"

In the Box

Celestron C11-A XLT 11" f/10 Schmidt-Cassegrain Telescope (OTA Only, CGE Dovetail)

40mm Eyepiece

1.25" 90° Diagonal

SCT Visual Back

9x50mm Finderscope

Universal Mounting Plate, CGE

Limited 2-Year Warranty

Based on Astronomy magazine’s telescope "report cards", scopes of this size and type generally perform as follows . . .


Terrestrial Observation:	No
Lunar Observation:	Very Good
Planetary Observation:	Very Good
Binary and Star Cluster Observation:	Very Good
Galaxy and Nebula Observation:	Very Good
Photography:	Yes
Terrestrial Photography:	No
Lunar Photography:	Yes
Planetary Photography:	Yes
Star Cluster / Nebula / Galaxy Photography:	Yes

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Celestron C11-A XLT 11" f/10 Schmidt-Cassegrain Telescope (OTA Only, CGE Dovetail)

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