PlaneWave DeltaRho 500 OTA

PlaneWave DeltaRho 500 – 20-Inch Fast Astrograph Telescope System

The DeltaRho 500 from PlaneWave Instruments is a testament to innovation, engineered for serious astronomers, astrophotographers, and institutions seeking fast, wide-field performance. With a 20-inch aperture and a blazing fast f/3.03 focal ratio, the DeltaRho 500 is purpose-built to deliver high-resolution, large-format imaging for deep-sky astrophotography, research, and space communication.

Employing an advanced corrected Cassegrain focus design, the DeltaRho 500 provides a flat field and minimal aberration across a generous 70mm image circle. The carbon fiber optical tube assembly ensures structural rigidity and thermal stability, making it ideal for both professional observatories and remote installations.

Key Specifications

Optical Design: Corrected Cassegrain Focus
Clear Aperture: 508mm (20 in)
Focal Ratio: f/3.03
Focal Length: 1537mm
Back Focus: 232.8mm from mounting surface (147.6mm with Series-5XL Focuser and Rotator)
Image Circle: 70mm (>2.6 degrees)
OTA Construction: Carbon fiber – lightweight and rigid
Extension Spacer: Required when using both Series-5XL Focuser and Series-5 Rotator together

Performance & Applications

- Ultra-Fast Imaging:
The fast f/3.03 focal ratio enables exceptionally short exposure times—ideal for wide-field deep-sky imaging and time-critical observations.

- Wide Field Coverage:
With a 70mm image circle, the DeltaRho 500 supports large-format sensors for full-frame astrophotography with excellent edge-to-edge sharpness.

- Scientific Versatility:
Suitable for research applications such as survey imaging, transient object detection, and satellite tracking when paired with compatible mount systems.

- Structural Reliability:
Carbon fiber tube and minimal thermal expansion provide consistent optical performance in varying environmental conditions.

- Flexible Instrumentation Support:
Optional Series-5XL Focuser and Rotator enhance usability for both automated and remote observatories.