PlaneWave CDK20 f/6.8 Optical Tube Assembly | PixelSkiesAstro
search
  • PlaneWave CDK20 f/6.8 Optical Tube Assembly | PixelSkiesAstro
  • PlaneWave CDK20 f/6.8 Optical Tube Assembly | PixelSkiesAstro
  • PlaneWave CDK20 f/6.8 Optical Tube Assembly | PixelSkiesAstro
  • PlaneWave CDK20 f/6.8 Optical Tube Assembly | PixelSkiesAstro
  • PlaneWave CDK20 f/6.8 Optical Tube Assembly | PixelSkiesAstro

PlaneWave CDK20 f/6.8 Optical Tube Assembly

50.700,00 €
Tasse incluse

PlaneWave CDK20 f/6.8 Optical Tube Assembly The CDK20 f/6.8 is a 508 mm Corrected Dall-Kirkham astrograph with a 3454 mm focal length. Its design has no off-axis coma or astigmatism and a flat field across a 52 mm image circle.

Manufacturer model: PlaneWave CDK20 f/6.8 OTA (200104Q) · Specifications checked against manufacturer data on 2026-11-03

PlaneWave CDK20 f/6.8 Optical Tube Assembly

The CDK20 f/6.8 is a 508 mm Corrected Dall-Kirkham astrograph with a 3454 mm focal length. Its design has no off-axis coma or astigmatism and a flat field across a 52 mm image circle.

Construction

Fused silica mirrors and a carbon fibre truss minimise focus shift with temperature. Cooling fans, a Delta-T-ready system and mirror heater pads keep the optics stable and free of dew.

Optical system

Optical design Corrected Dall-Kirkham
Aperture 508 mm (20")
Focal length 3454 mm
Focal ratio f/6.8
Central obstruction 39% of primary diameter
Image circle 52 mm
Primary mirror 508 mm optical / 521 mm outer, prolate ellipsoid, fused silica, enhanced aluminium 96%
Secondary mirror 191 mm spherical, fused silica, enhanced aluminium 96%
Corrector lenses 90 mm, broadband AR (<0.5% reflection, 400–700 nm)

Mechanical

Back focus from mounting surface 224 mm (8.81")
OTA length 1194 mm (47")
Weight 63.5 kg (140 lb)
Tube Carbon fibre truss

Manufacturer documentation

PlaneWave CDK20 f/6.8 OTA

Compatibility notes

CDK20 f/6.8, not the f/7.7 version (3951 mm) or IRDK20. Optical RMS performance not published on the f/6.8 page.

1323220Q

Scheda tecnica

Apertura (mm)
508
Back focus attacco (mm)
224
Design
Corrected Dall-Kirkham
Focale (mm)
3454
Rapporto focale
f/6.8
Cerchio d'immagine (mm)
52
Lunghezza (mm)
1194
Lenti
90 mm broadband AR
Ostruzione
39% diameter
Primario
508/521 mm prolate ellipsoid fused silica, Al 96%
Secondario
191 mm spherical fused silica, Al 96%
Peso (kg)
63.5
Hai usato questo prodotto? Condividi la tua esperienza con altri astronomi.
Commenti (0)
Ancora nessuna recensione da parte degli utenti.

Prodotti visti

16 altri prodotti della stessa categoria:

Celestron EdgeHD 14 | PixelSkiesAstro
Celestron

Celestron EdgeHD 14

Celestron EdgeHD 14 — 356 mm aplanatic Schmidt-Cassegrain (CGE dovetail) The EdgeHD 14 optical tube is...
10.499,00 €
Tempi di consegna da confermare
Vedi attrezzatura →