SUMMARY
Combining power and ease-of-use, the Celestron CPC Deluxe 925 HD 9.25" f/10 Aplanatic Schmidt-Cassegrain GoTo Telescope is the mid-size offering in the CPC Deluxe line, improving the light gathering ability over the smaller 8" without the size and weight of the larger 11" model. This complete observational platform is ideal for near and deep-space visual exploration and astrophotography. Optically, it features an aplanatic Schmidt-Cassegrain optical system consisting of a corrector plate, a spherical primary mirror, and a secondary mirror along with a set of field flattening lenses integrated into the baffle tube. Complementing the EdgeHD system is the proprietary StarBright XLT optical coating system that improves light transmission and reflectivity across the entire visual spectrum. The combination of EdgeHD and StarBright XLT produces bright and clear high-resolution images with true color rendition across the entire field of view without distortion, aberrations, or off-axis comas.
Optimized for imaging, the internal focusing system features mirror support clutches to ensure proper alignment and mirror locks to avoid accidental defocusing during long-exposure astrophotography; and the optical tube is outfitted with a 2" visual back to use larger eyepieces and accessories. 2" eyepieces typically have wider fields of view and longer eye reliefs than similar 1.25" versions for more comfortable viewing, and the larger back ensures full coverage of today's imaging sensors to avoid vignetting. A reducer adapter is also included to enable the use of the more common 1.25" eyepieces, accessories, and imaging gear. For visual observations, a 2" star diagonal is included along with a 23mm Plössl eyepiece that yields 102x magnification. The motorized dual fork-mount has dual axis servo motors that provide precision movements, and an integrated 48-channel GPS receiver that sends information to the hand controller and requires limited input from the user; and the heavy-duty stainless steel tripod helps limit vibrations to ensure clear resolution during observation or imaging sessions.
The brain of the entire system is the NexStar computer controller. Equipped with a database of over 40,000 objects, including the planets, stars, nebulae, galaxies, and the complete Messier catalog, it can also be programmed with up 99 custom user-defined objects, and filters added for custom object lists. Its intuitive menu-driven user interface puts the power to observe the heavens with nine slew speeds and three tracking rates, plus anti-backlash compensation and Permanent Periodic Error Correction (PPEC) for smoother movements in the motors and improved tracking over time. Features such as guided tours, extended information on 200 popular objects, and multiple alignment options make the NexStar controller easy to use and invaluable to new users and experienced star-gazers.
HIGHLIGHTS
Optical Tube
9.25" (235mm) aperture
f/10 focal ratio
2350mm effective focal length
Aplanatic Schmidt-Cassegrain optical design
EdgeHD field-flattener aplanatic design eliminates spherical aberration, field curvature and off-axis star coma to improve resolution, and sharpness and clarity across the entire field of view — especially at the edges
Fine-annealed Pyrex glass reduces internal light loss to improve color, clarity, and sharpness
StarBright XLT optical coatings
Flexible tension clutches hold the primary mirror in place to reduce image shift without putting any force or pressure on the mirror assembly, keeping subjects centered
Internal mirror locks prevent accidental adjustment to focus — important during long-exposure astrophotography
Internal focusing mechanism
Resolution: 0.59 arc sec (Rayleigh); 0.49 arc sec (Dawes)
Secondary mirror obstruction: 3.35" (85mm); 36% by diameter; 13% by area
StarBright XLT System
Maximizes light transmission through optical path
Improves color rendition, contrast, sharpness, resolution, and brightness
Broadband system provides flat wavelength transmission across the entire visual spectrum
Multi-layer mirror coatings with layers of aluminum, SiO2 (quartz), TiO2 (titanium dioxide), and Si02 (silicon 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
NexStar Hand Controller
40,000+ object database
99 user-defined programmable celestial or terrestrial objects
Enhanced information on over 200 objects
Nine slew speeds: 4°/sec, 2°/sec, 0.5°/sec, 64x, 16x, 8x, 4x, 1x, 0.5x
Three tracking rates: Sidereal, Solar, Lunar
Multiple Alignment Procedures: Sky align, Auto two-star, Two-star, Solar system, EQ north, and EQ south
Tour Mode: System seeks out the best objects for the date and time, and automatically slews to them
Constellation Tour: Takes the user on a tour of the best objects within a specific constellation
Identify Mode: Use to identify an unknown object in the field of view, or to find other celestial objects that are close to where the user is viewing
Anti-Backlash Compensation: Trains out the intrinsic play between gears for more precise slewing and tracking
Periodic Error Correction (PEC): System learns its internal tracking errors and improves over time for more precise tracking, requiring fewer corrections
Built-in instructions guide users through the alignment procedures
Double line, 16 character LCD display with 19-button fiber-optic backlit LED keypad
RS-232 communication port
CPC Mount and Tripod
Mount:
Dual Fork tine cast aluminum
Dual-axis DC servo motors with digital encoders to improve tracking and GoTo precision
Motor Resolution: 0.1406 arc sec
RA Axis: 5.78" 180-tooth brass gear; Stainless steel worm gear
9.8" azimuth bearing
Internal 48-channel GPS receiver sends date, time, location information to hand controller, requiring no input by user
Altitude and Azimuth locking knobs
Ports: Autoguider, two auxiliary ports, PC interface
Detachable hand controller holder
9 - 15 VDC power requirement
Tripod:
Adjustable height
2" diameter stainless steel legs
Accessory tray for holding eyepieces, filters, etc
Center support bracket locks legs in place to add stability and reduce vibrations
Weight: 19 pounds
Included Accessories
Eyepiece:
2" barrel diameter
Accepts most 2" astronomical filters
23mm focal length produces 102x power
40' field of view at 1000 yards
0.8° angle of view
Diagonal:
90° angle places head in comfortable viewing position
2" snout and holder
Star configuration corrects view horizontally but not vertically
Reducer Adapter:
2"-to-1.25"
Allows the use of smaller eyepieces and accessories to be used with the included visual back and diagonal
Finderscope:
Low 9x magnification ensures a wide field of view for easier alignment
50mm objective allows users to see dimmer objects to have more alignment star choices
Includes quick release bracket
Power Adapter:
9 - 15 VDC
Car/vehicle port plug
