Cassegrain Telescopes
The Hubble Corrected Dall-Kirkham (CDK) is a revolutionary optical design offering a large, flat focal surface perfect for modern high-resolution CCD cameras. Featuring our sandwich mirror technology for rapid thermal equilibrium and a completely CNC-machined closed tube OTA optimized for zero thermal focal shift, the CDK delivers affordable, high-performance astrophotography and visual use.
Timelapse of the assembly of the new CDK20 (50 cm) at Volkssterrenwacht MIRA, Belgium.
Francisco José Calvo — Irydeo Observatory
"It is a raw image, with nothing special... except the focal length... ~2200mm!! Yes, it is working at ~ f/5; after some tests, I attached a second-hand Takahashi CR 0.73x reducer... and it works! The field is almost flat (I need to improve the collimation a bit more, and it will be 100% flat). Its performance is amazing, together with a 22.5mm x 22.5mm sensor (QHY42 sCMOS)."
"It continues working hard... Tonight, we reported two new potential NEOs, one of which has a MOID of only 0.005 AUs:"
The Corrected Dall-Kirkham (CDK) optical configuration provides a large, flat focal surface that is perfect for modern, high-resolution CCD cameras. An affordable, high-performance solution for astrophotography and visual use.
Premium quality, diffraction-limited optical systems deliver stunning views of the heavens. Combined with our revolutionary sandwich primary, CDK optics bring superior optical performance in real-world situations.
Our mirrors reach thermal equilibrium extremely fast without active cooling. Active cooling systems such as fans introduce micro-vibration that degrades image quality — our sandwich mirrors eliminate this problem entirely.
Our 2-section completely CNC-machined closed tube OTA is optimized for zero thermal focal shift and is structurally much stronger than a single section tube. Built for precision and durability.
| Optical Aperture | 254mm |
| System Focal Ratio | 8 |
| Focal Length | 2032mm |
| Field Of View | 55mm |
| Obstruction Ratio | 40% |
| Back Focus | 110mm |
| Focuser | 3" Dual Speed Crayford |
| Weight | 14.5 kg (32 lbs) |
| OTA Length | 622mm |
| Coating | 96% enhanced |
| Delivery | ~30 Days |
| Optical Aperture | 317.5mm |
| System Focal Ratio | 8 |
| Field Of View | 60mm |
| Obstruction Ratio | 40% |
| Back Focus | 163.5mm |
| Focuser | 3" dual speed Crayford |
| Weight | 22.7 kg (50 lbs) |
| OTA Length | 762mm |
| Coating | 96% enhanced |
| Delivery | ~60 Days |
| Optical Aperture | 432mm |
| System Focal Ratio | 6.8 |
| Field Of View | 70mm |
| Obstruction Ratio | 40% |
| Back Focus | 228mm |
| Focuser | 3" dual speed Crayford |
| Weight | 42 kg (93 lbs) |
| OTA Length | 950mm |
| Coating | 96% enhanced |
| Delivery | ~90 Days |
| System Focal Ratio | 6.8 |
| Field Of View | 70mm |
| Obstruction Ratio | 40% |
| Back Focus | 254mm |
| Focuser | 3.5" dual speed Crayford |
| Weight | 63.5 kg (140 lbs) |
| OTA Length | 1052mm |
| Coating | 96% enhanced |
| Delivery | ~90 Days |
The CDK1000 is a breakthrough collaboration of Assy Observatory (Kazakhstan), Hubble Optics, and their partners. The telescope is installed at the observatory's remotely operated site in Chile.
| Optical Aperture | 1000mm |
| System Focal Ratio | 6.5 |
| Focal Length | 6500mm |
| Field Of View | 100mm |
| Obstruction Ratio | 44% |
| Back Focus | 370mm |
| Weight | 1500 kg (3307 lbs) |
| Mount | Worm gear or direct drive |
| Tracking Accuracy | Worm gear: ±0.1 arcsec with Renishaw rotary encoders. Direct drive: expected periodic error less than ±0.1 arcsec. |
| Pointing Accuracy | ±5 arcsec |
| Slewing Speed | Up to 3.5°/sec (worm gear) or 8°/sec (direct drive) |
Image courtesy of Assy Observatory (Chile).
To buy CDK Optics (Primary, Secondary Mirrors and Corrector) and also find out shipping costs, please e-mail us!
| CDK10 f/8 | $4,999 |
| CDK12.5 f/8 | $7,999 |
| CDK17 f/6.8 | $15,999 |
| CDK20 f/6.8, f/11 | $25,999 |
| CDK24 f/6.5 | $49,999 |
| CDK700mm f/6.5 | $77,999 |
| CDK800mm f/6.5 | $109,999 |
| CDK1000 f/6.5 (complete system with mount) | Contact Us |