PlaneWave CDK14 f/7.2 Optical Tube Assembly The CDK14 is a 356 mm Corrected Dall-Kirkham astrograph with a 2563 mm focal length. The design has no off-axis coma or astigmatism and a flat field, for sharp stars to the edge of large sensors.
Manufacturer model: PlaneWave CDK14 f/7.2 OTA · Specifications checked against manufacturer data on 2026-11-03
The CDK14 is a 356 mm Corrected Dall-Kirkham astrograph with a 2563 mm focal length. The design has no off-axis coma or astigmatism and a flat field, for sharp stars to the edge of large sensors.
Construction
Fused silica mirrors with low thermal expansion and a carbon fibre truss tube minimise focus shift during long sessions. Backplate fans speed thermal equilibrium, and mirror heater pads are ready for the Delta-T controller.
Optical system
Optical design
Corrected Dall-Kirkham
Aperture
356 mm (14")
Focal length
2563 mm
Focal ratio
f/7.2
Central obstruction
23.5% by area; 48.5% by diameter
Image circle
52 mm (spec table); 70 mm flat field (feature list)
Optical performance
3.1 µm RMS at 13 mm; 6 µm RMS at 35 mm off-axis
Primary mirror
355.6 mm optical, prolate ellipsoid, enhanced aluminium 96%
Secondary mirror
165 mm spherical, fused silica, enhanced aluminium 96%
Corrector lenses
95 mm, broadband AR (<0.5% reflection, 400–700 nm)
Mechanical
Back focus from mounting surface
282 mm (11.09")
OTA length
889 mm (35")
Weight
22 kg (48 lb)
Upper / lower cage
Carbon fibre truss / carbon fibre truss with light shroud
Standard CDK14, not IRDK14. PlaneWave page lists 70 mm flat field in features but 52 mm image circle in spec table; both shown. Losmandy D dovetail. Primary outer diameter published inconsistently, omitted.
1323214Q
Scheda tecnica
Apertura (mm)
356
Back focus attacco (mm)
282
Design
Corrected Dall-Kirkham
Focale (mm)
2563
Rapporto focale
f/7.2
Cerchio d'immagine (mm)
52 (table); 70 (features)
Lunghezza (mm)
889
Lenti
95 mm broadband AR
Ostruzione
23.5% area; 48.5% diameter
Prestazioni
3.1 um @13 mm; 6 um @35 mm
Primario
355.6 mm prolate ellipsoid, Al 96%
Secondario
165 mm spherical fused silica, Al 96%
Peso (kg)
22
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PlaneWave CDK14 f/7.2 Optical Tube Assembly The CDK14 is a 356 mm Corrected Dall-Kirkham astrograph with a 2563 mm focal length. The design has no off-axis coma or astigmatism and a flat field, for sharp stars to the edge of large sensors.
Manufacturer model: PlaneWave CDK14 f/7.2 OTA · Specifications checked against manufacturer data on 2026-11-03
