TS Optics Photoline AP 72/432 FPL53 OTA

Description

Track solar eclipse events and wide-field open clusters with the TS Optics Photoline AP 72/432 FPL53 OTA high-resolution mobile travel astrophotography refractor optical tube assembly. Operating at a fast f/6.0 optical speed with a 432mm focal length, this 72mm (2.83 in) clear aperture instrument delivers a 1.61 arcseconds theoretical resolving power and reaches magnitude 12.0, collecting photons efficiently for wide-field rich-field visual scanning and portable deep-sky imaging.

The optical system features an air-spaced extra-low dispersion doublet objective combining Ohara FPL-53 Super ED glass with a matched lanthanum element, treated with broadband fully multi-coated (FMC) transmission layers with an unobstructed 0% central profile. Built inside an aluminum chassis measuring 335mm retracted and 390mm extended with a 90mm outer dew shield diameter, the tube assembly supplies 145mm of back focus from the 2-inch visual back (55mm standard from dedicated M48 flattener threads). Supported by a 2.5-inch dual-speed rack-and-pinion focuser, an M63x1 rear thread, and a 360-degree field rotator, this 2.30 kg (5.07 lbs) refractor covers a 44mm full-frame circle with dedicated optical correctors.

Key Features of TS Optics Photoline AP 72/432 FPL53 OTA

Engineered for travel astrophotography and eclipse chasing, this 72mm ED doublet couples Ohara FPL-53 glass with a rotatable 2.5-inch rack-and-pinion focuser. CNC-machined split tube rings, a standard Vixen dovetail bar, and a compact retracted profile provide dependable field performance on lightweight tracker mounts.

• 72mm (2.83 in) clear aperture with 432mm focal length and fast f/6.0 optical speed
• Air-spaced ED doublet objective featuring Ohara FPL-53 and lanthanum glass
• Broadband fully multi-coated (FMC) transmission coatings with 0% central obstruction
• 2.5-inch dual-speed rack-and-pinion focuser 1:10 with M63x1 thread and field 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 standard 44mm Vixen dovetail bar and retractable dew shield
• Step-down 2-inch to 1.25-inch visual back adapter with brass compression ring included

Lanthanum-ED Doublet Dispersion Control

Pairing an Ohara FPL-53 center element with high-index lanthanum mating glass controls chromatic dispersion across visible wavelengths, preventing color fringing on bright lunar edges and stellar points. The unobstructed optical train preserves high image contrast while supporting practical visual magnifications from 10.3x up to 144x.

Heavy-Duty 2.5-Inch Drawtube & M63 Threaded Coupling

Holding camera trains and visual diagonals securely is handled by a 2.5-inch rack-and-pinion focuser equipped with a 1:10 micro-reduction drive, an M63x1 camera connection thread, and an integrated 360-degree field rotator. Weighing just 2.30 kg, this optical tube assembly clamps securely into CNC-machined rings and attaches to tracking saddles via standard Vixen dovetails.

• 2.5-inch dual-speed rack-and-pinion focuser with 1:10 fine-tuning control for critical sharpness
• Direct M63x1 rear camera thread with integrated 360-degree rotator for flexure-free imaging
• CNC-machined aluminum tube rings with a 44mm Vixen-style dovetail bar for rapid setup

TS Photoline Doublet ED Series Warranty

The TS Optics Photoline AP 72/432 FPL53 OTA is backed by a 2-year limited warranty against material and manufacturing defects. The complete factory package contains the 72/432 Photoline OTA, retractable dew shield, CNC tube rings, Vixen dovetail bar, and a 2-inch to 1.25-inch adapter.