TS Optics Photoline AP 140/910 Carbon OTA

Description

Maintaining focal stability during rapid nocturnal temperature shifts, the TS Optics Photoline AP 140/910 Carbon OTA is a large-aperture lightweight apochromatic doublet refractor optical tube assembly. Operating at an f/6.5 optical speed with a 910mm focal length, this 140mm (5.51 in) aperture telescope yields a 0.83 arcseconds theoretical resolving power and reaches magnitude 13.4, collecting photons for high-thermal-stability deep-sky astrophotography, transportable visual observing, and lunar video imaging.

The optical system features an air-spaced ED doublet combining an Ohara FPL-53 Super ED element with special lanthanum glass inside a low-expansion carbon fiber chassis, treated with broadband fully multi-coated (FMC) layers and an unobstructed 0% central profile. Measuring 790mm retracted and 920mm extended with a 170mm outer dew shield diameter, the assembly supplies 170mm of back focus from the rear mechanical thread. Fitted with a heavy-duty 3.7-inch dual-speed rack-and-pinion focuser and a built-in 360-degree field rotator, this 8.50 kg (18.74 lbs) refractor covers a 44mm full-frame image circle when paired with dedicated correctors.

Key Features of TS Optics Photoline AP 140/910 Carbon OTA

Built for traveling astrophotographers and visual observers seeking large 5.5-inch aperture with reduced tube weight, this 140mm doublet pairs Ohara FPL-53 glass with a rigid carbon fiber tube. An oversized 3.7-inch rack-and-pinion focuser, CNC-machined tube rings, and a 75mm Losmandy-style dovetail bar ensure mechanical stability under photographic payloads.

• 140mm (5.51 in) clear aperture with 910mm focal length and fast f/6.5 optical speed
• Air-spaced ED doublet objective featuring Ohara FPL-53 Super ED and lanthanum optical glass
• Low-expansion carbon fiber chassis minimizing thermal focal drift during imaging sessions
• Broadband fully multi-coated (FMC) optical layers with an unobstructed 0% central profile
• 3.7-inch heavy-duty dual-speed rack-and-pinion focuser 1:10 with built-in 360-degree rotator
• Generous 170mm back focus distance measured from the rear mechanical thread
• Corrected 44mm full-frame image circle when paired with dedicated flattener or reducer
• CNC-machined tube rings, 75mm Losmandy-style dovetail bar, top handle, and finder shoe included

High-Thermal-Stability Lanthanum-ED Doublet System

Pairing an Ohara FPL-53 element with high-index lanthanum glass controls chromatic dispersion across broad spectral bands, eliminating distracting color halos on bright objects. The rigid carbon fiber tube maintains optical focal plane positioning as outdoor temperatures drop, while the unobstructed 140mm aperture supports practical magnifications from 20.0x up to 280x.

Carbon Fiber Structural Integrity & Heavy Drawtube Drive

Holding heavy camera equipment without drawtube sag is delivered through a 3.7-inch rack-and-pinion focuser with a 1:10 micro-reduction gear and an integrated 360-degree manual field rotator. Weighing just 8.50 kg with rings and handle, this large-aperture optical tube assembly balances easily on medium-to-heavy equatorial mount saddles.

• 3.7-inch dual-speed rack-and-pinion focuser with 1:10 micro-reduction for smooth focusing control
• Built-in 360-degree camera field rotator for rapid target orientation without losing focus
• Carbon fiber composite tube construction delivering high stiffness with low thermal expansion

TS Carbon Fiber Doublet Series Factory Guarantee

The TS Optics Photoline AP 140/910 Carbon OTA is backed by a 2-year limited warranty against material and manufacturing defects. The complete factory package contains the Carbon Fiber 140/910 ED OTA, CNC tube rings, Losmandy dovetail bar, carrying handle, 2-inch to 1.25-inch adapter, and a finder shoe.