PlaneWave DeltaRho 280 f/2.75 Astrograph OTA
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- 280 mm / 11 in aperture
- 770.6 mm focal length
- Fast f/2.75 focal ratio
- 55 mm image circle
- More than 4 degrees field of view with a 55 mm sensor
- 163 mm (6.4 in) back focus from mounting surface
- 467 mm (18.375 in) total OTA length including focuser
- Carbon fiber optical tube
- Integrated dew control
- Low-profile focuser with 0.5 in travel
- Built-in tip-tilt focal plane adjustment
- Compatible with the L350 Direct Drive Mount
- User-friendly collimation software
DeltaRho 280
11" Wide-Field Astrograph
Built on the DeltaRho platform, the DR280 delivers fast, wide-field imaging in a compact, carbon fiber system. With a 280 mm aperture, 770.6 mm focal length, and fast f/2.75 focal ratio, it is designed to capture large areas of the sky with speed, precision, and consistency.
A 55 mm image circle supports sensors with more than 4 degrees of field of view, making DR280 ideal for wide-field astronomical imaging, sky surveys, and professional research applications where coverage and image quality matter.
About the DeltaRho 280
Built for Wide-Field Sky Coverage
DR280 is designed for fast, wide-field image capture. Its 280 mm aperture provides significant light-gathering capability, while the f/2.75 focal ratio enables efficient imaging across large areas of the sky.
With a 55 mm image circle and more than 4 degrees of field of view, DR280 is built for applications where speed and coverage are essential, from deep-sky imaging to large-scale survey work.
Carbon Fiber Structure
The carbon fiber optical tube provides a rigid, lightweight structure designed to maintain stability through changing environmental conditions. For fast optical systems, mechanical precision is critical. DR280 is engineered to keep the optical path stable and support consistent imaging performance across the full field.
Integrated Dew Control
DR280 includes integrated dew control to help protect optical surfaces from condensation during long observing sessions. Built-in heater technology helps maintain clarity and reduce interruptions caused by changing temperature and humidity conditions.
Low-Profile Focuser
The low-profile focuser provides 0.5 inches of travel and allows 4.25 inches of back focus from the back of the racked-in focuser. This gives users the spacing needed to support camera integration while maintaining a compact mechanical profile.
Built-In Tip-Tilt Focal Plane Adjustment
DR280 includes built-in tip-tilt focal plane adjustment to help align the camera sensor with the telescope’s optical axis. This supports sharp, consistent stars across the full field of view, especially when using large-format sensors.
Collimation Software
DR280 is equipped with user-friendly collimation software designed to help users align the optical system quickly and accurately. This is critical for maintaining the resolution, sharpness, and field performance required for professional imaging and research.
Mount Compatibility
DR280 is compatible with the L350 Direct Drive Mount, creating a high-performance imaging system for observatory-class applications.
Specifications
Optical Systems
- Aperture: 280 mm (11 in)
- Focal Length: 770.6 mm
- Focal Ratio: 2.75
- Central Obstruction: 63%
- Back Focus from Mounting Surface: 163 mm (6.4 in)
- Back Focus from Racked in Focuser: 108 mm (4.25 in)
- Weight: 14.5 kg (32lbs)
- OTA Length: 451 mm (17.75")
- Optical Design Performance: 4.0 micron RMS on-axis, 4.1 micron RMS at 21mm off-axis, 4.5 micron RMS at 27.5mm off-axis
- Upper Cage: Carbon Fiber Tube
- Image Circle Size: 55 mm
Lens Group
- Diameter: 120 mm (4.72 in)
- Coating: Broadband AR Coatings Less than 1% reflected from 400-800 nm
Secondary Mirror
- Diameter: 170 mm (6.7 in)
- Material: Fused silica (Quartz)
- Shape: Spherical
- Coating: Enhanced Aluminum 360-820 nm optimized
Primary Mirror
- Optical Diameter: 280 mm (11 in)
- Outer Diameter: 300 mm (11.8 in)
- Shape: Asphere
- Material: Fused Silica (Quartz)
- Coating: Enhanced Aluminum 360-820 nm optimized
Other Information
- Country of Manufacture: United States
DeltaRho 280
11" Wide-Field Astrograph
Built on the DeltaRho platform, the DR280 delivers fast, wide-field imaging in a compact, carbon fiber system. With a 280 mm aperture, 770.6 mm focal length, and fast f/2.75 focal ratio, it is designed to capture large areas of the sky with speed, precision, and consistency.
A 55 mm image circle supports sensors with more than 4 degrees of field of view, making DR280 ideal for wide-field astronomical imaging, sky surveys, and professional research applications where coverage and image quality matter.
About the DeltaRho 280
Built for Wide-Field Sky Coverage
DR280 is designed for fast, wide-field image capture. Its 280 mm aperture provides significant light-gathering capability, while the f/2.75 focal ratio enables efficient imaging across large areas of the sky.
With a 55 mm image circle and more than 4 degrees of field of view, DR280 is built for applications where speed and coverage are essential, from deep-sky imaging to large-scale survey work.
Carbon Fiber Structure
The carbon fiber optical tube provides a rigid, lightweight structure designed to maintain stability through changing environmental conditions. For fast optical systems, mechanical precision is critical. DR280 is engineered to keep the optical path stable and support consistent imaging performance across the full field.
Integrated Dew Control
DR280 includes integrated dew control to help protect optical surfaces from condensation during long observing sessions. Built-in heater technology helps maintain clarity and reduce interruptions caused by changing temperature and humidity conditions.
Low-Profile Focuser
The low-profile focuser provides 0.5 inches of travel and allows 4.25 inches of back focus from the back of the racked-in focuser. This gives users the spacing needed to support camera integration while maintaining a compact mechanical profile.
Built-In Tip-Tilt Focal Plane Adjustment
DR280 includes built-in tip-tilt focal plane adjustment to help align the camera sensor with the telescope’s optical axis. This supports sharp, consistent stars across the full field of view, especially when using large-format sensors.
Collimation Software
DR280 is equipped with user-friendly collimation software designed to help users align the optical system quickly and accurately. This is critical for maintaining the resolution, sharpness, and field performance required for professional imaging and research.
Mount Compatibility
DR280 is compatible with the L350 Direct Drive Mount, creating a high-performance imaging system for observatory-class applications.
Specifications
Optical Systems
- Aperture: 280 mm (11 in)
- Focal Length: 770.6 mm
- Focal Ratio: 2.75
- Central Obstruction: 63%
- Back Focus from Mounting Surface: 163 mm (6.4 in)
- Back Focus from Racked in Focuser: 108 mm (4.25 in)
- Weight: 14.5 kg (32lbs)
- OTA Length: 451 mm (17.75")
- Optical Design Performance: 4.0 micron RMS on-axis, 4.1 micron RMS at 21mm off-axis, 4.5 micron RMS at 27.5mm off-axis
- Upper Cage: Carbon Fiber Tube
- Image Circle Size: 55 mm
Lens Group
- Diameter: 120 mm (4.72 in)
- Coating: Broadband AR Coatings Less than 1% reflected from 400-800 nm
Secondary Mirror
- Diameter: 170 mm (6.7 in)
- Material: Fused silica (Quartz)
- Shape: Spherical
- Coating: Enhanced Aluminum 360-820 nm optimized
Primary Mirror
- Optical Diameter: 280 mm (11 in)
- Outer Diameter: 300 mm (11.8 in)
- Shape: Asphere
- Material: Fused Silica (Quartz)
- Coating: Enhanced Aluminum 360-820 nm optimized
- 1x OTA Cover - To protect the primary mirror and inside of the optical tube
- 1x Wrench Set (5812A35) - Standard hex wrenches (European orders only)
- 280 mm / 11 in aperture
- 770.6 mm focal length
- Fast f/2.75 focal ratio
- 55 mm image circle
- More than 4 degrees field of view with a 55 mm sensor
- 163 mm (6.4 in) back focus from mounting surface
- 467 mm (18.375 in) total OTA length including focuser
- Carbon fiber optical tube
- Integrated dew control
- Low-profile focuser with 0.5 in travel
- Built-in tip-tilt focal plane adjustment
- Compatible with the L350 Direct Drive Mount
- User-friendly collimation software
DeltaRho 280
11" Wide-Field Astrograph
Built on the DeltaRho platform, the DR280 delivers fast, wide-field imaging in a compact, carbon fiber system. With a 280 mm aperture, 770.6 mm focal length, and fast f/2.75 focal ratio, it is designed to capture large areas of the sky with speed, precision, and consistency.
A 55 mm image circle supports sensors with more than 4 degrees of field of view, making DR280 ideal for wide-field astronomical imaging, sky surveys, and professional research applications where coverage and image quality matter.
About the DeltaRho 280
Built for Wide-Field Sky Coverage
DR280 is designed for fast, wide-field image capture. Its 280 mm aperture provides significant light-gathering capability, while the f/2.75 focal ratio enables efficient imaging across large areas of the sky.
With a 55 mm image circle and more than 4 degrees of field of view, DR280 is built for applications where speed and coverage are essential, from deep-sky imaging to large-scale survey work.
Carbon Fiber Structure
The carbon fiber optical tube provides a rigid, lightweight structure designed to maintain stability through changing environmental conditions. For fast optical systems, mechanical precision is critical. DR280 is engineered to keep the optical path stable and support consistent imaging performance across the full field.
Integrated Dew Control
DR280 includes integrated dew control to help protect optical surfaces from condensation during long observing sessions. Built-in heater technology helps maintain clarity and reduce interruptions caused by changing temperature and humidity conditions.
Low-Profile Focuser
The low-profile focuser provides 0.5 inches of travel and allows 4.25 inches of back focus from the back of the racked-in focuser. This gives users the spacing needed to support camera integration while maintaining a compact mechanical profile.
Built-In Tip-Tilt Focal Plane Adjustment
DR280 includes built-in tip-tilt focal plane adjustment to help align the camera sensor with the telescope’s optical axis. This supports sharp, consistent stars across the full field of view, especially when using large-format sensors.
Collimation Software
DR280 is equipped with user-friendly collimation software designed to help users align the optical system quickly and accurately. This is critical for maintaining the resolution, sharpness, and field performance required for professional imaging and research.
Mount Compatibility
DR280 is compatible with the L350 Direct Drive Mount, creating a high-performance imaging system for observatory-class applications.
Specifications
Optical Systems
- Aperture: 280 mm (11 in)
- Focal Length: 770.6 mm
- Focal Ratio: 2.75
- Central Obstruction: 63%
- Back Focus from Mounting Surface: 163 mm (6.4 in)
- Back Focus from Racked in Focuser: 108 mm (4.25 in)
- Weight: 14.5 kg (32lbs)
- OTA Length: 451 mm (17.75")
- Optical Design Performance: 4.0 micron RMS on-axis, 4.1 micron RMS at 21mm off-axis, 4.5 micron RMS at 27.5mm off-axis
- Upper Cage: Carbon Fiber Tube
- Image Circle Size: 55 mm
Lens Group
- Diameter: 120 mm (4.72 in)
- Coating: Broadband AR Coatings Less than 1% reflected from 400-800 nm
Secondary Mirror
- Diameter: 170 mm (6.7 in)
- Material: Fused silica (Quartz)
- Shape: Spherical
- Coating: Enhanced Aluminum 360-820 nm optimized
Primary Mirror
- Optical Diameter: 280 mm (11 in)
- Outer Diameter: 300 mm (11.8 in)
- Shape: Asphere
- Material: Fused Silica (Quartz)
- Coating: Enhanced Aluminum 360-820 nm optimized
Other Information
- Country of Manufacture: United States
- 1x OTA Cover - To protect the primary mirror and inside of the optical tube
- 1x Wrench Set (5812A35) - Standard hex wrenches (European orders only)
PlaneWave DeltaRho 280 f/2.75 Astrograph OTA