PlaneWave DeltaRho 350 f/3 Optical Tube Assembly The DeltaRho 350 is a fast 350 mm, f/3 corrected-Cassegrain astrograph with a 1050 mm focal length and a flat 60 mm image circle covering more than 3 degrees. Its speed and field suit wide-field deep-sky imaging as well as space situational and domain awareness (SSA/SDA) surveys.
Manufacturer model: PlaneWave DeltaRho 350 f/3 OTA · Specifications checked against manufacturer data on 2026-11-03
The DeltaRho 350 is a fast 350 mm, f/3 corrected-Cassegrain astrograph with a 1050 mm focal length and a flat 60 mm image circle covering more than 3 degrees. Its speed and field suit wide-field deep-sky imaging as well as space situational and domain awareness (SSA/SDA) surveys.
Construction
Carbon fibre truss poles and shroud keep the tube light and thermally stable. Collimation software supports quick, accurate alignment, and the primary and secondary mirrors carry dew heaters for the Delta-T controller.
Optical system
Optical design
Corrected Cassegrain focus
Aperture
350 mm
Focal length
1050 mm
Focal ratio
f/3
Central obstruction
56% by diameter
Image circle
60 mm (>3°)
Optical performance
4.9 µm RMS on-axis; 5.6 µm at 23 mm; 6.4 µm at 30 mm off-axis
Primary mirror
350 mm optical, prolate ellipsoid, fused silica, enhanced aluminium 96%
Secondary mirror
190 mm spherical, fused silica, enhanced aluminium 96%
Corrector lenses
110 mm, broadband AR (<0.5% reflection, 400–700 nm)
Mechanical
Back focus from mounting surface
142.24 mm (5.6", includes filter refraction); 64.135 mm with Series-5 focuser and rotator
OTA length
584 mm (23")
Weight
21 kg (46 lb)
Tube
Carbon fibre truss poles with carbon fibre shroud
Standard manufacturer package
Primary and secondary mirror dew heaters (need Delta-T controller 600195)
PlaneWave lists back focus as 143.535 mm (features) and 142.24 mm (spec table); table value used. Losmandy D dovetail; Keller EZ saddle on L-350. Series-5 focuser and rotator optional.
Additional specifications
Bf series5 (mm)
64.135
1323135
Fiche technique
Diamètre (mm)
350
Backfocus de la monture (mm)
142.24 (table); 143.535 (features)
Conception
Corrected Cassegrain focus
Focale (mm)
1050
Rapport F/D
f/3
Cercle image (mm)
60
Longueur (mm)
584
Lentilles
110 mm broadband AR
Obstruction
56% diameter
Performances
4.9 um on-axis; 5.6 um @23 mm; 6.4 um @30 mm
Primaire
350 mm prolate ellipsoid fused silica, Al 96%
Secondaire
190 mm spherical fused silica, Al 96%
Poids (kg)
21
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PlaneWave DeltaRho 350 f/3 Optical Tube Assembly The DeltaRho 350 is a fast 350 mm, f/3 corrected-Cassegrain astrograph with a 1050 mm focal length and a flat 60 mm image circle covering more than 3 degrees. Its speed and field suit wide-field deep-sky imaging as well as space situational and domain awareness (SSA/SDA) surveys.
Manufacturer model: PlaneWave DeltaRho 350 f/3 OTA · Specifications checked against manufacturer data on 2026-11-03
