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The CDK (Corrected Dall-Kirkham) Optical Design is an innovative solution for unsurpassed astroimaging quality at an affordable price. The CDK telescope design provides excellent imaging with large format CCD cameras while remaining superb for visual use. The CDK design far exceeds the off-axis performance of most commercial telescope designs including the Ritchey-Chrétien design.
This no-compromise design is unique in making the optical alignment forgiving and collimation very easy. This guarantees the user the best possible performance from the telescope. The end result at the image plane of the CDK design is no off-axis coma, no off-axis astigmatism, perfectly flat field (no off-axis defocus). The CDK design will give you pinpoint stars from the center to the corner of the field of view.
STANDARD FEATURES
Carbon Fiber TubeDesign
Dovetail expansion joint
2.75 inch Hedrick Focuser
Cooling Fans
Actual shipping will be calculated and billed separately at the time of shipping.
Call to find out about a package discount with an L-350 mount.
Please note that this is the "upgraded" fused silica mirror . We do not recommend pyrex.| Aperture | 12.5 inch (318 mm) |
| Focal Length | 2541 mm (100.04 inch) |
| Focal ratio | f/8 |
| Central Obstruction | 42% of the Primary Mirror Diameter |
| Back Focus from Mounting Surface | 10.445 inch (265 mm) |
| Back Focus from Racked in Focuser | 7.2 inch (183 mm) |
| OTA Length | 31 inch (787 mm) |
| Optical Tube | Carbon Fiber |
| Dimensions | Overall Dimensions (PDF) |
| Weight (includes manual-focuser and dovetail) | 46 lbs (20.9 kg) |
| Weight (includes electronic-focuser and dovetail) | 48.5 lbs (22.0 kg) |
SECONDARY MIRROR
| Diameter | 4.65 inch (118 mm) |
| Material | Precision Annealed Borosilicate or Fused Silica |
| Shape | Spherical |
| Coating | Enhanced Aluminum - 96% |
PRIMARY MIRROR
| Optical Diameter | 12.5 inch (318 mm) |
| Outer Diameter | 13 inch (330 mm) |
| Shape | Prolate Ellipsoid |
| Material | Precision Annealed Borosilicate or Fused Silica |
| Coating | Enhanced Aluminum - 96% |
LENS GROUP
| Diameter | 70 mm (2.76 inch) |
| Number of lenses | 2 |
| Coating | Broadband AR Coatings (less than .5% reflected from 400 to 700nm) |
SHIPPING
| Crated Shipping Weight | 163 lbs (73.9 kg) |
| Crate Width | 22 inch (559 mm) |
| Crate Height | 29 inch (737 mm) |
| Crate Length | 48 inch (1,219 mm) |
INCLUDED ACCESSORIES
| 2.75" to 2" Adapter (125355) | Adapts the 2.75" inner diameter of the focuser to a standard 2" inner diameter. This adapter is necessary when setting the primary to secondary spacing. The 125399 Visual 2.75" to 2" adapter is an optional accessory that is designed to space a 2" diagonal for visual use. |
| Ronchi Spacer (200354) | This spacer is used for setting the primary to secondary spacing. It has an 1-1/4 inner diameter and may be used with 1-1/4 oculars for collimation. |
| Ronchi Ocular | This ocular is a Ronchi screen used for setting the primary to secondary spacing. |
| OTA Cover | The OTA cover is for closing the front of the tube to protect the primary mirror and the inside of the optical tube. |
| Printed Instructions | For Collimation and Spacing |
| 12VDC Power Supply (18778) | Provides power for the fans (Not included for European Orders) |
| Free Shipping | No |
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