TS Optics Photon N 254/1270 OTA

Description

Operating at a 1270mm focal length with 0.46 arcseconds theoretical resolving power, the TS Optics Photon N 254/1270 OTA is a large-aperture parabolic newtonian reflector telescope optical tube assembly built for visual exploration and planetary video astronomy. Sized with a 254mm (10.00 in) clear aperture and an f/5.0 focal ratio, this instrument gathers light to visual magnitude 14.7, delivering high-contrast planetary detail and recording prime-focus deep-sky astrophotography targets.

The optical system features a parabolic primary mirror fabricated from low thermal expansion borosilicate glass, treated with enhanced aluminum coatings delivering 94% reflectivity with an SiO2 overcoat, maintaining a moderate 27.6% central obstruction by diameter (7.6% by area) from its 70mm secondary mirror. Built inside a rolled solid steel tube measuring 1210mm in length with a 285mm outer diameter, the tube assembly supplies 65mm of back focus above the 2-inch visual back. Supported by a 2-inch Monorail dual-speed linear bearing focuser, this 15.20 kg (33.51 lbs) telescope illuminates a 44mm full-frame image circle when paired with optional TS-GPU coma correctors.

Key Features of TS Optics Photon N 254/1270 OTA

Built for visual observers and planetary astrophotographers seeking high optical contrast with large 10-inch light grasp, this f/5.0 Newtonian combines an extended focal length with a dual-speed Monorail focuser. Its rigid steel chassis, CNC-machined split tube rings, and 75mm Losmandy-style dovetail bar ensure dependable support on heavy equatorial mounts.

• 254mm (10.00 in) clear aperture with 1270mm focal length and versatile f/5.0 optical speed
• Parabolic primary mirror made from low-expansion borosilicate optical glass
• Enhanced aluminum mirror coatings with 94% reflectivity and protective SiO2 overcoat
• Moderate central obstruction of 27.6% by diameter (7.6% by area) for high visual contrast
• 2-inch Monorail dual-speed linear bearing focuser 1:10 with 1.25-inch adapter
• Generous 65mm back focus above the 2-inch visual back for cameras and coma correctors
• Corrected 44mm full-frame image circle when paired with optional TS-GPU coma corrector
• 12V primary mirror cooling fan, CNC tube rings, Losmandy dovetail, 8×50 finderscope, and 35mm extension included

High-Contrast Parabolic Primary & Moderate Obstruction

By keeping the central obstruction to a moderate 27.6% by diameter, the 254mm parabolic primary mirror preserves high contrast on lunar craterlets and planetary cloud bands while delivering color-free optical performance. Borosilicate glass maintains optical figure stability during temperature changes, supporting practical visual magnifications from 36.3x up to 508x.

Linear Bearing Drawtube Stability & Visual Extension Tube

Holding visual eyepieces and camera setups without drawtube tilt is managed by a 2-inch Monorail focuser featuring a central stainless steel guide rail with a 1:10 micro-reduction drive. An integrated 12V fan accelerates primary mirror thermal stabilization, while the included 35mm 2-inch extension tube provides instant visual back positioning for diagonal and eyepiece use.

• 2-inch Monorail dual-speed linear bearing focuser with 1:10 micro-reduction to prevent drawtube flexure
• Rear 12V cooling fan circulating ambient air to accelerate primary mirror thermal stabilization
• Heavy-duty rolled steel tube construction providing high mechanical stability and collimation hold

TS-Photon Steel Newtonian Series Warranty

The TS Optics Photon N 254/1270 OTA is backed by a 2-year limited warranty against material and manufacturing defects. The complete factory package contains the 254/1270 Newtonian OTA, 12V primary mirror cooling fan, CNC tube rings, Losmandy dovetail bar, 2-inch Monorail focuser, 1.25-inch adapter, 8×50 optical finderscope, and a 35mm extension tube.