TS Optics AP 70/420 ED V2 OTA

Description

Eliminating chromatic aberration without adding excessive payload weight to travel mounts, the TS Optics AP 70/420 ED V2 OTA is a portable grab and go apochromatic doublet refractor optical tube assembly. Operating at a fast f/6.0 focal ratio with a 420mm focal length, this 70mm (2.76 in) clear aperture telescope delivers a 1.66 arcseconds theoretical resolving power and reaches magnitude 11.9, gathering photons for ultra-portable travel astrophotography, wide-field visual exploration, and daylight spotting.

The optical system features an air-spaced ED doublet objective combining Ohara FPL-53 Super ED glass with a matched lanthanum element, treated with broadband fully multi-coated (FMC) anti-reflection layers with an unobstructed 0% central profile. Built inside an aluminum chassis measuring 305mm retracted and 360mm extended with an 88mm outer dew shield diameter, the tube provides 145mm of back focus from the 2-inch visual back. Equipped with a 2-inch dual-speed rack-and-pinion focuser, an M54x0.75 camera thread, and an integrated 360-degree rotator, this 2.10 kg (4.63 lbs) refractor covers a 44mm full-frame image circle when paired with dedicated correctors.

Key Features of TS Optics AP 70/420 ED V2 OTA

Built for mobile deep-sky astrophotography and grab-and-go observing, this 70mm ED doublet couples Ohara FPL-53 glass with a rotatable 2-inch rack-and-pinion focuser. CNC-machined split tube rings, a standard Vixen dovetail bar, and a compact retracted length make it an ideal optical platform for lightweight travel tripods.

• 70mm (2.76 in) clear aperture with 420mm focal length and fast f/6.0 optical speed
• Air-spaced ED doublet objective featuring Ohara FPL-53 Super ED and lanthanum glass
• Broadband fully multi-coated (FMC) optical layers with an unobstructed 0% central profile
• 2-inch dual-speed rack-and-pinion focuser 1:10 with M54x0.75 thread and 360-degree rotator
• Generous 145mm back focus distance measured from the 2-inch visual back
• Corrected 44mm full-frame image circle when paired with dedicated flattener or reducer
• CNC-machined tube rings with 44mm Vixen-style dovetail bar and retractable dew shield
• Step-down 2-inch to 1.25-inch visual back adapter with brass compression ring included

FPL-53 Super ED & Lanthanum Doublet Color Purity

Pairing an Ohara FPL-53 center element with high-refraction lanthanum glass controls chromatic dispersion across broad spectral bands, eliminating color fringing on bright lunar limbs and stellar points. The unobstructed optical train delivers crisp contrast while supporting practical visual magnifications from 10.0x up to 140x.

Direct M54 Camera Coupling & 360-Degree Drawtube Rotation

Focusing precision is delivered through a 2-inch rack-and-pinion focuser with a 1:10 micro-reduction drive, an M54x0.75 rear camera thread, and an integrated 360-degree field rotator for framing celestial compositions. Weighing only 2.10 kg, this optical tube assembly clamps securely onto compact tracker saddles via standard Vixen dovetails.

• 2-inch dual-speed rack-and-pinion focuser with 1:10 fine-focus drive for critical focal adjustments
• Direct M54x0.75 rear thread with 360-degree rotator for flexure-free imaging connections
• CNC-machined aluminum tube rings with standard 44mm Vixen dovetail bar for rapid mounting

TS Photoline Travel Series Warranty & Hardware

The TS Optics AP 70/420 ED V2 OTA is backed by a 2-year limited warranty against material and manufacturing defects. The complete factory package contains the 70/420 ED V2 OTA, retractable dew shield, CNC tube rings, Vixen-style dovetail bar, and a 2-inch to 1.25-inch adapter.