Planewave CDK17 f/6.8 Astrograph Tube with Fused Silica Optics 1323217Q
The PlaneWave Instruments CDK17 is a 17-inch (0.43 m) f/6.8 Astrograph Dall-Kirkham corrected telescope. The CDK17 covers a 70 mm field of view without any field curvature, off-axis coma or astigmatism. The instrument weighs 43 kg (94 lbs) and comes standard with a backplate retaining ring ready to accept the focuser of your choice.
The abbreviation CDK stands for the optical system of the PlaneWave astrographs - a Dall Kirkham Cassegrain with an optical correction unit. More about the optical design (CDK)
- Astrograph "CDK17", 17-inch with borosilicate or fused-silica optics
- modified according to Dall-Kirkham, with fully corrected image field
- focal length 2,939 mm (f/8)
- Delta T Ready, 3.5" Hedrick focuser and EFA kit available separately
- Requires packaging #1323517. Packaging will be charged separately.
TECHNICAL SPECIFICATIONS:
OPTICS
- Optical Design: Dall-Kirkham Corrected (CDK)
- Aperture (mm): 17" (432 mm)
- Focal Length: 2,939 mm (115.71 inches)
- Focal ratio: f/6.8
- Image Field: 70 mm
- Rear Focusing Distance: 260 mm (10.24") from mounting surface, 184 mm (7.24") from rack focus
- Central Obscuration: 23.7% surface area, 49% of primary mirror diameter
- Substrate: Fused silica
- Optical length: 42 inches (1,067 mm)
- Optical tube weight: 48 kg (106 lbs)
Planewave CDK17 f/6.8 astrograph tube with fused silica optics 1323217Q
