
PlaneWave DeltaRho 500 Telescope
Starting Price: $69,000.00
Price as Configured: $69,000.00
Price as Configured: $69,000.00
Brand: PlaneWave Instruments / SKU: PW-200128Q
The DeltaRho 500 from PlaneWave Instruments is a testament to innovation, designed for the serious astronomer and astrophotographer. Crafted with a dedication to excellence, the DeltaRho 500 offers advanced features for elite imaging, providing unparalleled versatility for a broad range of scientific and communicative applications.
The DeltaRho 500 stands out with its exceptional features:
- Large 508mm (20 inch) aperture
- 1537 mm focal length
- Fast f/3.03 focal ratio
- 70mm image circle (>2.6 degrees)
- 232.8 mm back focus from mounting surface; 147.6 mm with Series-5XL Focuser and Rotator
- The Extension Spacer is required only when the Series-5XL Focuser and the Series-5 Rotator are used in conjunction.
- Advanced corrected Cassegrain focus optical design
- Robust carbon fiber tube construction
NOTE: Shipping cost will be determined after the order is made and must be paid for before the telescope will ship. A shipping quote can be obtained on request.

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Optical Systems:
Aperture | 20 in (508 mm) |
Focal Length | 60.5 in (1537 mm) |
Focal Ratio | f/3 |
Central Obstruction | 59 % by diameter |
Back Focus from Mounting Surface | 9.166 in (232.8 mm) from mounting surface; 7.271 inch (184.7 mm) from lens cell |
Weight | 165 lbs (75 kg) |
OTA Length | 35.1 inch (892 mm) |
Optical Design Performance | 3.86 micron RMS on-axis, 4.04 micron RMS at 22 mm off-axis, and 6.04 micron RMS at 35 mm off-axis |
Upper Cage | Carbon fiber truss poles with carbon fiber shroud |
Image Circle Size | 70 mm |
Lens Group:
Diameter | 6.3 inch (160 mm) |
Coating | Broadband AR Coatings (on avg. less than .5% reflected from 400 to 700 nm) |
Secondary Mirror:
Diameter | 286 mm (11.26 in) |
Material | Fused silica (quartz) |
Shape | Spherical |
Coating | Enhanced aluminum – 96% |
Primary Mirror:
Optical Diameter | 20 in (508 mm) |
Outer Diameter | 20.8 in (528 mm) |
Shape | Prolate ellipsoid |
Material | Fused Silica (quartz) |
Coating | Enhanced aluminum – 96% |