PlaneWave CDK20 Optical Tube Assembly (F/7.77)

Capturing the most stunning astrophotographs possible is something our team is passionate about. From design to manufacture, our goal with the Corrected Dall-Kirkham (CDK) 20″ telescope was centered around performance and ease of use. The CDK20 is an incredible breakthrough in telescope technology and produces no off-axis coma and no off-axis astigmatism. Additionally, the CDK20 provides a perfectly flat field so your astrophotographs will have stunning clarity from corner to corner of the image without field curvature degrading the photos. Offering the simplicity of single-mirror collimation, the stray light control of advanced baffles, structural performance created through finite element analysis (FEA), and decades of telescope design experience, the CDK20 is an exceptional diffraction-limited telescope. CDK20 users can experience pinpoint stars edge-to-edge and a 45 x 45 arcminute field of view when using large 16803 size camera sensors. When equipment fades into the background and simply performs, the astrophotography experience becomes even more fun and rewarding!

• Additional 1.79″ of backfocus and 497 mm of focal length compared to the standard CDK20 f/6.8 model.
• f/7.77 and 3951 mm focal length.
• No coma, no off-axis astigmatism, and no field curvature.
• Pinpoint stars across a 52mm image circle.
• 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.
• If you have a standard CDK20 you can order the replaceable lens cell to convert to the f/7.77 model.