Hubble 10 and 12.5-inch F/8 CDK (Corrected Dall-Kirkham)
Optics, and beyond:
The SCT has been the industry-standard visual, film and small CCD imaging telescope
for popular astronomy since the mid-70s. However, the standard SCT has a highly
curved focal surface and suffers from considerable comatic aberration, which limits its
useful photographic field to a relatively small image circle. For instance, a 10” all
spherical SCT can provide 10-micron spot sizes over only a very small field of about
9mm diameter, which is clearly not suitable for today’s high resolution, large format
CCDs. The Hubble corrected Dall-Kirkham (CDK) optical configuration, as developed
over the last 13 years by Dave Rowe, is a revolutionary optical design that overcomes
these limitations. It is an affordable, high performance solution for astrophotography and
visual use, with a large, flat focal surface that is perfect for modern, high resolution, CCD
cameras.
Hubble CDK significantly outperforms many other popular designs, including Ritchey
Chretie. In particular, the CDK design is much easier to align and collimate than Ritchey
Chretie. Combined with our revolutionary sandwich primary, Our CDK 10" and 12.5"
optics will bring you superior optical performance in real world situations, even without
an active cooling system(Active cooling systems, such as fans, introduce their own
serious problems, such as micro vibration, which will degrade the image quality more or
less). Our mirrors reach equilibrium extremely fast, and without aid.
Optics, and beyond:
The SCT has been the industry-standard visual, film and small CCD imaging telescope
for popular astronomy since the mid-70s. However, the standard SCT has a highly
curved focal surface and suffers from considerable comatic aberration, which limits its
useful photographic field to a relatively small image circle. For instance, a 10” all
spherical SCT can provide 10-micron spot sizes over only a very small field of about
9mm diameter, which is clearly not suitable for today’s high resolution, large format
CCDs. The Hubble corrected Dall-Kirkham (CDK) optical configuration, as developed
over the last 13 years by Dave Rowe, is a revolutionary optical design that overcomes
these limitations. It is an affordable, high performance solution for astrophotography and
visual use, with a large, flat focal surface that is perfect for modern, high resolution, CCD
cameras.
Hubble CDK significantly outperforms many other popular designs, including Ritchey
Chretie. In particular, the CDK design is much easier to align and collimate than Ritchey
Chretie. Combined with our revolutionary sandwich primary, Our CDK 10" and 12.5"
optics will bring you superior optical performance in real world situations, even without
an active cooling system(Active cooling systems, such as fans, introduce their own
serious problems, such as micro vibration, which will degrade the image quality more or
less). Our mirrors reach equilibrium extremely fast, and without aid.
Hubble CDK10 f/8 Specification:
System Focal Ratio: 8
Field Of View: 45mm
Obstruction Ratio: 38%
Back Focus (from the last surface of the corrector lens): 253mm
Suggested Focuser Diameter: 2"
Primary Mirror:
Optical Diameter: 254mm (overall diameter 266mm)
Weight: ~4kg
Thickness: ~45mm
Focal Length: 1540mm
96-98% Enhanced coated
Strehl Ratio 0.95 or better.
Secondary Diameter: 95mm
99% dielectric coated.
Corrector Assembly:
99.5% broadband coated.
Delivery Time: ~90 days
CDK 10 f/8 Optics Only (Primary mirror, Secondary mirror and Corrector Assembly ):
$1200 + S&H (Plate Glass Primary)
$1500 + S&H (Pyrex Primary)
Hubble CDK12.5 f/8 Specification:
System Focal Ratio: 8
Field Of View: 60mm
Obstruction Ratio: 42%
Back Focus (from the last surface of the corrector lens): 318mm
Suggested Focuser Diameter: 3"
Primary Mirror:
Optical Diameter: 317.5mm (overall diameter 334mm)
Weight: ~6kg
Thickness: ~40mm
Focal Ratio: F/3
96-98% Enhanced coated
Strehl Ratio 0.95 or better.
Secondary Diameter: 120mm
99% dielectric coated.
Corrector Assembly:
99.5% broadband coated.
Delivery Time: ~90 days
CDK 12.5 F/8 Optics Only (Primary mirror, Secondary mirror and Corrector Assembly ):
$1950 + S&H (Plate Glass Sandwich Mirror)
$2495 + S&H (Pyrex Glass Sandwich Mirror)
System Focal Ratio: 8
Field Of View: 45mm
Obstruction Ratio: 38%
Back Focus (from the last surface of the corrector lens): 253mm
Suggested Focuser Diameter: 2"
Primary Mirror:
Optical Diameter: 254mm (overall diameter 266mm)
Weight: ~4kg
Thickness: ~45mm
Focal Length: 1540mm
96-98% Enhanced coated
Strehl Ratio 0.95 or better.
Secondary Diameter: 95mm
99% dielectric coated.
Corrector Assembly:
99.5% broadband coated.
Delivery Time: ~90 days
CDK 10 f/8 Optics Only (Primary mirror, Secondary mirror and Corrector Assembly ):
$1200 + S&H (Plate Glass Primary)
$1500 + S&H (Pyrex Primary)
Hubble CDK12.5 f/8 Specification:
System Focal Ratio: 8
Field Of View: 60mm
Obstruction Ratio: 42%
Back Focus (from the last surface of the corrector lens): 318mm
Suggested Focuser Diameter: 3"
Primary Mirror:
Optical Diameter: 317.5mm (overall diameter 334mm)
Weight: ~6kg
Thickness: ~40mm
Focal Ratio: F/3
96-98% Enhanced coated
Strehl Ratio 0.95 or better.
Secondary Diameter: 120mm
99% dielectric coated.
Corrector Assembly:
99.5% broadband coated.
Delivery Time: ~90 days
CDK 12.5 F/8 Optics Only (Primary mirror, Secondary mirror and Corrector Assembly ):
$1950 + S&H (Plate Glass Sandwich Mirror)
$2495 + S&H (Pyrex Glass Sandwich Mirror)
*The ACF data is based on the public information released by the Star-RC vs. Meade.
The CDK12.5 primary mirror is made with our revolutionary sandwich mirror. The
CDK10 is made with plate or Pyrex solid blank.
Our 2-section (completely CNC machined) closed tube OTA prototype is not only
optimized to reach a zero thermal focal shift, but is also structurally much stronger
than a single section tube.
CDK10 is made with plate or Pyrex solid blank.
Our 2-section (completely CNC machined) closed tube OTA prototype is not only
optimized to reach a zero thermal focal shift, but is also structurally much stronger
than a single section tube.
Hubble CDK17 f/6.8 Specification:
System Focal Ratio: 6.8
Field Of View: 60mm
Obstruction Ratio: 39%
Back Focus (from the last surface of the corrector lens): 341mm
Suggested Focuser Diameter: 3"
Primary Mirror:
Optical Diameter: 432mm
Weight: ~13kg (Plate Glass), ~12kg (Pyrex)
Thickness: ~55mm
Focal Ratio: F/2.6
96-98% Enhanced coated
Strehl Ratio 0.95 or better.
Secondary Diameter: 160mm
99% dielectric coated.
Corrector Assembly:
99.5% broadband coated.
$5500 + S&H (Plate Glass Sandwich Mirror)
$6700 + S&H (Pyrex Glass Sandwich Mirror)
Delivery Time: ~90 days
Hubble CDK20 f/6.8 Specification:
System Focal Ratio: 6.8
Field Of View: 70mm
Obstruction Ratio: 39%
Back Focus (from the last surface of the corrector lens): 341mm
Suggested Focuser Diameter: 3"
Primary Mirror:
Optical Diameter: 500mm
Weight: ~20kg (Plate Glass), ~18kg (Pyrex)
Thickness: ~55mm
Focal Ratio: F/2.6
96-98% Enhanced coated
Strehl Ratio 0.95 or better.
Secondary Diameter: 188mm
99% dielectric coated.
Corrector Assembly:
99.5% broadband coated.
$8000 + S&H (Plate Glass Sandwich Mirror)
$9500 + S&H (Pyrex Glass Sandwich Mirror)
Delivery Time: ~90 days
Hubble CDK24 f/6.8
Coming Soon!!!!!
Hubble CDK28 f/6.6
Coming Soon!!!!!
System Focal Ratio: 6.8
Field Of View: 60mm
Obstruction Ratio: 39%
Back Focus (from the last surface of the corrector lens): 341mm
Suggested Focuser Diameter: 3"
Primary Mirror:
Optical Diameter: 432mm
Weight: ~13kg (Plate Glass), ~12kg (Pyrex)
Thickness: ~55mm
Focal Ratio: F/2.6
96-98% Enhanced coated
Strehl Ratio 0.95 or better.
Secondary Diameter: 160mm
99% dielectric coated.
Corrector Assembly:
99.5% broadband coated.
$5500 + S&H (Plate Glass Sandwich Mirror)
$6700 + S&H (Pyrex Glass Sandwich Mirror)
Delivery Time: ~90 days
Hubble CDK20 f/6.8 Specification:
System Focal Ratio: 6.8
Field Of View: 70mm
Obstruction Ratio: 39%
Back Focus (from the last surface of the corrector lens): 341mm
Suggested Focuser Diameter: 3"
Primary Mirror:
Optical Diameter: 500mm
Weight: ~20kg (Plate Glass), ~18kg (Pyrex)
Thickness: ~55mm
Focal Ratio: F/2.6
96-98% Enhanced coated
Strehl Ratio 0.95 or better.
Secondary Diameter: 188mm
99% dielectric coated.
Corrector Assembly:
99.5% broadband coated.
$8000 + S&H (Plate Glass Sandwich Mirror)
$9500 + S&H (Pyrex Glass Sandwich Mirror)
Delivery Time: ~90 days
Hubble CDK24 f/6.8
Coming Soon!!!!!
Hubble CDK28 f/6.6
Coming Soon!!!!!
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