PlaneWave CDK24 f/6.5 Optical Tube Assembly The CDK24 is a 610 mm Corrected Dall-Kirkham astrograph with a 3974 mm focal length and a flat, coma- and astigmatism-free 70 mm image circle, for observatory-class research and imaging.
Manufacturer model: PlaneWave CDK24 f/6.5 OTA (240104Q) · Specifications checked against manufacturer data on 2026-11-03
The CDK24 is a 610 mm Corrected Dall-Kirkham astrograph with a 3974 mm focal length and a flat, coma- and astigmatism-free 70 mm image circle, for observatory-class research and imaging.
Construction
Fused silica mirrors and a carbon fibre truss with aluminium light shroud minimise focus shift with temperature. Cooling fans and Delta-T-ready mirror heaters keep the optics stable and clear of dew.
Optical system
Optical design
Corrected Dall-Kirkham
Aperture
610 mm (24")
Focal length
3974 mm
Focal ratio
f/6.5
Central obstruction
47% of primary diameter
Image circle
70 mm
Optical performance
2.4 µm RMS on-axis; 4.0 µm at 26 mm; 4.8 µm at 35 mm off-axis
Primary mirror
610 mm optical / 622 mm outer, prolate ellipsoid, enhanced aluminium 96%
Secondary mirror
280 mm spherical, fused silica, enhanced aluminium 96%
Corrector lenses
135 mm, broadband AR (<0.5% reflection, 400–700 nm)
PlaneWave CDK24 f/6.5 Optical Tube Assembly The CDK24 is a 610 mm Corrected Dall-Kirkham astrograph with a 3974 mm focal length and a flat, coma- and astigmatism-free 70 mm image circle, for observatory-class research and imaging.
Manufacturer model: PlaneWave CDK24 f/6.5 OTA (240104Q) · Specifications checked against manufacturer data on 2026-11-03
