TS Optics RC 152/1370 Ritchey-Chretien OTA

Description

Designed with a coma-free all-reflective optical train to eradicate chromatic aberration, the TS Optics RC 152/1370 Ritchey-Chretien OTA is a true Ritchey-Chretien deep-sky astrograph optical tube assembly. Operating at an f/9.0 focal ratio with a 1370mm focal length, this 152mm (5.98 in) aperture instrument delivers a 0.76 arcseconds theoretical resolving power and reaches magnitude 13.6, collecting light for long-focus deep-sky astrophotography, faint galaxy auditing, and planetary nebula imaging.

The optical system features hyperbolic primary and secondary mirrors manufactured from fused quartz substrates, treated with 99% high-reflectivity enhanced dielectric coatings and a protective SiO2 layer, with a 47.4% central obstruction by diameter (22.5% by area) from its 72mm secondary mirror holder. Built inside a rolled steel tube measuring 435mm without focuser and 500mm with focuser with a 191mm outer diameter, the assembly supplies 159mm of back focus from the rear mechanical thread. Supported by an external 2-inch Monorail dual-speed linear bearing focuser, this 5.40 kg (11.90 lbs) telescope illuminates a native 28mm APS-C optimized image circle and covers full-frame formats when paired with optional flattener or reducer optics.

Key Features of TS Optics RC 152/1370 Ritchey-Chretien OTA

Built for astrophotographers seeking a compact, coma-free optical system for small galaxies and planetary nebulae, this 6-inch Ritchey-Chretien pairs fused quartz mirrors with a rigid steel tube. Its external Monorail linear bearing focuser, direct-mounted Vixen dovetail bar, and three M90 extension rings provide a dependable platform on portable tracking mounts.

• 152mm (5.98 in) clear aperture with 1370mm focal length and f/9.0 optical speed
• True Ritchey-Chretien optical design with hyperbolic primary and secondary mirrors
• Fused quartz optical mirror substrates providing high thermal stability
• Enhanced dielectric mirror coatings with 99% reflectivity and protective SiO2 layer
• 2-inch Monorail dual-speed linear bearing focuser 1:10 preventing primary mirror shift
• Generous 159mm back focus distance with three included thread-on M90 extension spacers
• Native 28mm APS-C image circle expandible to full-frame with optional correctors
• Chassis-mounted 44mm Vixen-style dovetail bar and 1.25-inch compression adapter included

Coma-Free Fused Quartz Mirrors & 99% Dielectric Coatings

Hyperbolic primary and secondary mirrors cancel coma and spherical aberration natively without refractive corrector plates, eliminating false-color fringing on bright stars. Fused quartz substrates maintain precise optical figure during changing nocturnal temperatures, supporting practical visual and video magnifications from 21.7x up to 304x.

Monorail Linear Bearing Focuser & M90 Spacer Hardware

Because the primary mirror remains fixed within its rear cell, focusing does not introduce mirror tilt or focal shift. The external 2-inch Monorail focuser utilizes a central stainless steel guide rail with a 1:10 micro-reduction drive, while three included M90 extension rings (two 25mm and one 50mm) allow precise spacing for filter wheels and cameras.

• 2-inch Monorail dual-speed linear bearing focuser with 1:10 micro-tuning to eliminate drawtube sag
• Fixed primary mirror architecture ensuring optical collimation and field stability during exposures
• Three modular M90 threaded extension spacers (two 25mm, one 50mm) for flexible camera spacing

TS Ritchey-Chretien Series Factory Warranty

The TS Optics RC 152/1370 Ritchey-Chretien OTA is backed by a 2-year limited warranty against material and manufacturing defects. The complete factory package contains the Steel Tube RC 6-inch OTA with internal knife-edge baffles, 2-inch Monorail dual-speed focuser, 1.25-inch adapter, and three M90 extension rings.