The Rowe-Ackermann Schmidt Astrograph Design
The Rowe-Ackermann design pairs speed with performance. Based on the original Schmidt camera design, the RASA optical tube offers major advantages to astro-photographers by giving you a short focal length for relatively a large aperture. The result is a wide-field f/2.2 system offering the advantage of better apparent tracking. With only a 620mm focal length, exposure times are also greatly reduced when compared to traditional Schmidt Cassegrain telescopes. You'll be capturing better images in a fraction the time, without the need of an autoguider!
As CCD imaging has advanced, large sensors have become readily available in increasingly more affordable cameras. While the imaging hobby has grown in leaps and bounds there has been very little changed in optical designs to accommodate these large imaging sensors. That is until now. The Celestron RASA offers an exceptionally sharp 70mm image circle. This creates such a wide field, you'll be able to fill even the largest imaging chips with edge to edge pin point stars with minimal vignetting. The Rowe-Ackermann scopes are perfect for creating giant night sky mosaics, surveying and comet hunting. Designed with 4-element rare-earth glass, images are free of false color, coma and field curvature. Optical quality this excellent has been unheard of in astrographs within this price range.Advanced features like a custom engineered linear brass focuser bearing and FeatherTouch Micro Focus Knob allow you to make the fine adjustments you need to capture the perfect shot. Meanwhile, a12V MagLev fan reduces cooldown time and provides optimal airflow through the dust filtered optical tube.
Engineered as a complete astroimaging system, every component of the Rowe-Ackermann Schmidt Astrograph is optimized for peak performance with DSLR and astronomical CCD cameras. Down to the thickness of the glass used in the included fully-multicoated optical window or an optional imaging filter, every component of the system has been taken into careful consideration to work together seamlessly.
Includes M48 and T-Thread camera adapters.
Celestron CGEM DX Mount and Tripod
The CGEM DX™ mount is the newest member of our fully computerized Equatorial mount series capable of carrying Celestron’s high-end 11" and 14" optical tubes. The CGE PRO style, 2.75" leg tripod holds even the our 14" optics securely while dampening vibration, which is ideal for both imaging and visual observing. Capable of holding 50 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 DX 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 DX series has a new 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 DX 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 DX will track well past the Meridian for uninterrupted imaging through the most ideal part of the sky. The CGEM mount has a robust database with over 40,000 objects, 100 user defined programmable objects and enhanced information on over 200 objects.
Power Management - Redesigned electronics deliver constant regulated power to the motors making them capable of driving the telescope even when not perfectly balanced. This allows the CGEM DX to have the payload capacity of that of much larger mounts without sacrificing smooth tracking motion and pointing accuracy across the entire sky.
Celestron CGEM DX Mount and Tripod Features
- Holds a maximum instrument capacity of 50 lbs
- CGEM DX Computerized Equatorial Mount
- Ultra sturdy 2.75" steel tripod with Accessory Tray
- 40,000 object database with over 100 user-definable objects and expanded information on over 200 objects
- Proven NexStar computer control technology
- Flash upgradeable hand control software and motor control units for downloading product updates over the Internet
- New "All-star" Polar alignment uses any bright star for a quick and accurate Polar alignment
- Software Features include: Mount Calibration, Database Filter Limits, Hibernate, five Alignment Procedures, and user-defined slew limits
- 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 stars; solar system objects and asterisms
- Permanent Programmable Periodic Error Correction (PEC) - corrects for periodic tracking errors inherent to all worm drives
- Steel worm gear and 90 mm pitch diameter brass worm wheel
- Drive Motors - Low Cog DC Servo motor with integrated optical encoders offer smooth, quiet operation and long life.
- The motor armatures are skewed to minimize cogging which is required for low speed tracking.
- Internal Cable wiring for trouble-free setup and transportation
- Designated six-pin RJ-12 modular jack, ST-4 compatible guide port
- Autoguide port and Auxiliary ports located on the electronic plate for long exposure astrophotography
- Double line, 16-character Liquid Crystal Display Hand Control with backlit LED buttons for easy operation of go to features
- RS-232 communication port on hand control to control the telescope via a personal computer
- Includes NexRemote telescope control software, for advanced control of your telescope via computer
- Precision machined 40 mm diameter steel Polar shafts supported by multiple tapered roller bearings and ball bearings
- GPS-compatible with optional SkySync GPS Accessory
This RASA CGEM DX telescope package includes a 2 year Celestron warranty.
- Additional Information
SKU CE-11006 UPC Code 050234110068 Manufacturer Celestron Telescope Series Celestron RASA Astrographs Optical Design Astrograph Mount Type Equatorial - Motorized w/GoTo Option Warranty 2 Year Warranty Telescope Aperture 11 in. Telescope Focal Ratio f/2.22 Telescope Focal Length 620mm Optical Coatings Celestron XLT Tube Color or Finish Celestron Grey Length of Optical Tube 33 in. Optical Tube Weight 35 lbs. Mount Weight 45 lbs. Head / 41 lbs. Tripod Focuser Size 2" Focuser Style Feather Touch Manual or Electronic Focusing? Manual Focusing Speeds Two-Speed Dew Shield Included? No, Sold Separately Diagonal Included? No - Sold Separately Finder Included None Eyepiece(s) Included None Hand Controller Included? Yes Power Adapter Included None - Does Not Require Power CD ROMs Included None Counterweights Included (1) 22 lb. Alignment Procedure EQ North Align, EQ South Align Tracking Modes EQ North, EQ South Objects in Database 40,000 + OTA Mount Type Losmandy-Style Dovetail Tripod Type Included None, Sold Separately Total Telescope Weight 122 lbs.
- Included Items
- 11" RASA Optical Tube
- M48 Camera Adapter
- T-Thread Camera Adapter
- CGEM-DX Mount
- 1 22 lb. counterweight
- Questions & Answers
Product QuestionsQuestion by: KMH9 on Apr 15, 2014 6:32:22 AMIf you are looking for a dual-purpose (photo/visual) telescope, the EdgeHD series from Celestron will be a much better fit. EdgeHD telescope are designed for both visual-observing and astro-imaging, through the visual-back at the rear of the telescope. Additionally, one can use third-party optics to utilize the Fastar interface (wherein the secondary mirror is removed and replaced with a corrector-lens/camera-adapter)... while not offering the same level of correction, this does make the EdgeHD somewhat like the RASA.
By comparison, the RASA optical-system is only meant for photographic applications. There is no visual-back, nor ability to adapt a diagonal or eyepiece.Answer by: Eric_B (Admin) on Apr 15, 2014 9:13:13 AMTwo quick questions: 1. What are the spot sizes on axis, 10mm off-axis, 15mm off-axis, 20mm off-axis, ....to 35mm of-axis? 2. What is the maximum load (weight of camera etthat can be placed at the image plane before the corrector's figure is compromised?Question by: DBaker on Jan 26, 2015 1:12:09 PMThank you for your question. According to the manual for this telescope, the RMS on axis spot size is <2.00 ?m while the RMS spot size at 21mm off axis is <2.25 ?m.
Celestron does not have a weight rating for what the corrector plate can handle but since the RASA was made for imaging with the Nightscape CCD cameras in mind, I would say that it can probably handle around 2-3 pounds before the figure is compromised.Answer by: Roderick (Admin) on Feb 1, 2015 9:32:02 AM
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