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PlaneWave Instruments brings a fully automated observatory class telescope to the market with the CDK700, a 0.7 meter Alt-Az telescope system, combining the revolutionary CDK optical design that founded PlaneWave Instruments with an innovative direct-drive alt/az mount technology that sets a new standard for small observatory telescopes.
- Pinpoint stars out to a 70mm image circle
- Ultra-low thermal expansion fused silica optics
- Dual Nasmyth focus, allowing simultaneous mounting of two instruments or easy switching between visual and imaging use
- Direct-drive motors on each axis for smooth, fast, and virtually silent movement of the telescope
- High resolution encoders on each axis for precise positioning
- Zero backlash
- Zero periodic error
- PointXP mount modelling software
- Field de-rotator / rotational field framing
An alt/az mount is inherently more stable than an equatorial mount since there is no cantilevered mass, nor are there any large protruding counterweights to create a dangerous hazard in a public observatory. An alt/az telescope is also considerably more compact than its equatorial counterpart, allowing a larger telescope to fit in a smaller enclosure. The mass it takes to make a rigid alt/az mount is substantially less, leading to cost savings.
Unlike German Equatorial mounts, there are no meridian flips to deal with. You can image from horizon to horizon continuously if desired. Alt/Az is more intuitive to use and no polar alignment is needed. Besides, it is the way the professionals do it!
Benefits of Nasmyth focus
The Nasmyth Focus is along the altitude axis so there are virtually no balancing issue as you change out equipment. Eyepieces remain at a constant wheelchair-accessible height, greatly simplifying access to the telescope for public observatories. The rotating tertiary mirror allows you to switch from one Nasmyth port to the other in just seconds, allowing observers to easily transition between imaging and visual use.
Rotating tertiary mirror
The CDK700 includes an integrated rotator for the tertiary mirror, with magnetic locks to position the mirror precisely for either Nasmyth focus position. The rotator can move from one port to the other in under 10 seconds.
Direct drive motors and encoders
Direct Drive motors mean that there are no gears to cause backlash and periodic error. With high-resolution encoders providing the feedback for the direct drive motors, not only will the telescope track without periodic error or have any backlash at all, but the mount will be able to counter against wind gusts. The direct drive motors can move the telescope at incredible speeds for tracking satellites or just to minimize target acquisition time.
|Aperture||700 mm (27.56")
||47% of the primary mirror diameter|
|Backfocus from mounting surface
|Optical performance (400-900 nm)
||1.8μ RMS at 25 mm on-axis; 4.4μ RMS at 21 mm off-axis; 6.8μ RMS at 35 mm off-axis|
||22μ per arcsecond
|Optimal field of view||70 mm image circle|
||Dual truss structure with Nasmyth focus
|Fully baffled field||60 mm
|Dimensions||93.73″ H x 43.25″ W x 39″ D|
|Outer diameter||714.38 mm|
||Fused silica (quartz)
|Radius of curvature||4115 mm|
|Outer diameter||317.5 mm|
||Fused silica (quartz)
||3 point RTV
|Radius of curvature||2961 mm|
|Optical major diameter
||Fused silica (quartz)|
||Single piece U shaped fork arm assembly for maximum stiffness|
||20" diameter thrust bearing|
||2 x 8.5" OD ball bearings|
||Dual truss structure with Nasmyth focus|
||Industrial grade Parker brushless motor control system and built in electronics|
||Direct Drive 3 Phase Axial-Flux Torque Motors|
||10 inch disk built into both axes with stainless steel encoder tape on the circumference with reader yields 16 million counts per revolution of the telescope. Translates to about 0.08 arcsecond resolution.|
||Approximately 30 ft-lbs continuous; 60 ft-lbs peak|
||Capable of controlling up to 4 high speed encoders, limit switch inputs, homing switch inputs, controls two additional motors for accessories, two brake outputs and 16 digital and 2 analogue inputs|
|Control software||Incorporates PointXP mount modelling software by Dave Rowe All ASCOM compatible.|
|Pointing accuracy||10 arcsecond RMS with PointXP Model|
||<1 arcsecond error over 10 minute period|
|System natural frequency
||10 Hz or greater|
|Field de-rotator accuracy
||3 microns of peak to peak error at 35mm off-axis over 1 hour of tracking (18 arcsec)|