TS Optics Photon N 254/1016 OTA

Description

Supplying fast f/4.0 optical speed for coma-corrected prime focus astrography, the TS Optics Photon N 254/1016 OTA is a large-aperture newtonian reflector telescope optical tube assembly built for deep-sky imaging. Featuring a 254mm (10.00 in) clear aperture and a 1016mm focal length, this instrument delivers a 0.46 arcseconds theoretical resolving power and reaches magnitude 14.7, gathering substantial light on faint galaxy clusters and extended emission nebulae.

The optical system features a fast parabolic primary mirror made from low thermal expansion borosilicate glass, treated with enhanced aluminum coatings yielding 94% reflectivity and protected by an SiO2 overcoat, paired with an 80mm secondary mirror producing a 31.5% central obstruction by diameter (9.9% by area). Housed in a solid rolled steel tube measuring 980mm in length with a 285mm outer diameter, the assembly supplies 65mm of back focus above the 2-inch visual back, optimized for DSLRs and dedicated cooled astronomy cameras with coma correctors. Equipped with a 2-inch Monorail dual-speed linear bearing focuser, this 14.50 kg (31.97 lbs) telescope covers a 44mm full-frame format when paired with optional TS-GPU or MaxField correctors.

Key Features of TS Optics Photon N 254/1016 OTA

Engineered for high-speed deep-sky astrophotography, this 10-inch f/4.0 Newtonian combines a fast parabolic primary mirror with an oversized 80mm secondary mirror for full sensor illumination. Its dual-speed Monorail focuser, primary mirror cooling fan, and 75mm Losmandy-style dovetail bar provide mechanical stability on heavy-capacity equatorial mounts.

• 254mm (10.00 in) clear aperture with 1016mm focal length and fast f/4.0 optical speed
• Parabolic primary mirror made from low-expansion borosilicate optical glass
• Enhanced aluminum mirror coatings with 94% reflectivity and protective SiO2 overcoat
• Oversized 80mm secondary mirror providing full sensor illumination on full-frame cameras
• 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 coma correctors and cameras
• Corrected 44mm full-frame image circle when paired with optional TS-GPU coma corrector
• Primary mirror 12V cooling fan, CNC tube rings, 75mm Losmandy dovetail, and 8×50 finderscope included

Ten-Inch Fast Parabolic Optical Figure & 80mm Secondary

The 254mm parabolic primary mirror collects extensive light to resolve delicate structural filaments in emission nebulae without chromatic aberration. The oversized 80mm secondary mirror illuminates full-frame sensor formats without corner vignetting, while the all-reflective system supports practical visual magnifications from 36.3x up to 508x.

Heavy-Duty Monorail Linear Track & 12V Cooling Fan

Carrying heavy imaging equipment without drawtube sag is delivered through a 2-inch Monorail focuser utilizing a central stainless steel guide track and 1:10 micro-tuning. An integrated rear 12V cooling fan circulates ambient air across the mirror cell to purge boundary layer thermals, while heavy CNC rings and a 75mm Losmandy bar keep the 14.50 kg steel tube balanced on mount saddles.

• 2-inch Monorail dual-speed linear bearing focuser with 1:10 fine tuning to eliminate drawtube flexure
• Rear 12V primary mirror cooling fan for rapid thermal equilibrium before imaging runs
• Solid rolled steel tube construction providing high durability and stable optical collimation

TS-Photon Solid Steel Astrograph Warranty

The TS Optics Photon N 254/1016 OTA is backed by a 2-year limited warranty against material and manufacturing defects. The complete factory package contains the 254/1016 Steel Tube OTA, primary mirror 12V 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.