PLANEWAVE CDK 20

Type: CDK 20 PLANEWAVE, aperture 20 inches (50cm), focal ratio f/6.8

OPTICAL SYSTEM Aperture

20 inch (508 mm)
Focal Length 3454 mm (135.98 inch)
Focal ratio F/6.8
Central Obstruction 39% of the Primary Mirror Diameter
Back Focus from Racked in Focuser 5.8 inch (147 mm)
Weight 140 lbs (63.5 kg)
OTA Length 47 inch (1,194 mm)
Upper Cage Carbon Fiber Truss
Lower Cage Carbon Fiber Truss with Carbon Fiber Light Shroud

 

SECONDARY MIRROR Diameter 7.5 inch (191mm)
Material Fuses Silica
Shape Spherical
Coating Enhanced Aluminum – 96%
PRIMARY MIRROR Optical Diameter 20 inch (508 mm)
Outer Diameter 20.5 inch (521 mm)
Shape Prolate Ellipsoid
Material Fused SIlica
Coating Enhanced Aluminum – 96%

 

LENS GROUP Diameter 90 mm (3.54 inch)
Number of lenses 2
Coating Broadband AR Coatings (less than .5% reflected from 400 to 700nm)

Camera: Moravian G4 9000 with filterwheel LRGB Halpha O III – S II

Resolution 3056 (H) × 3056 (V) pixels
Pixel size 12 μm (H) × 12 μm (V)
Image area 36.7 mm (H) × 36.7 mm (V)
Full well capacity ~110,000 e
Dark current 5 e/s/pixel at 25 °C
Dark signal doubling temperature 7 °C

KAF-09000 CCD specifications