The PlaneWave CDK Optical Design is an innovative solution for unsurpassed astroimaging quality at an affordable price, providing excellent imaging with large format CCD cameras while remaining superb for visual use. 

The image plane is no off-axis coma, no off-axis astigmatism, perfectly flat field (no off-axis defocus). The design gives you pinpoint stars from the center to the corner of the field of view.

• 20 inch (0.51 m) f/6.8 telescope with either Corrected Dall-Kirkham (CDK) or Ritchey-Chrétien (RC) optics
• Focal Length: 3,454 mm
• Field of View: 52 mm image circle
• No coma, no off-axis astigmatism, and no field curvature
• Rock solid fused silica mirrors with low thermal expansion
• Carbon fiber optical tube assembly for rigidity and fast cooling
• Simple secondary mirror collimation thanks to the fixed primary mirror
• 140 lbs (64 kg)