TS Optics CD-APO Deluxe AP 155/1240 OTA

Description

Ohara FPL-53 Super ED glass paired with German Schott mating glasses powers the TS Optics CD-APO Deluxe AP 155/1240 OTA observatory-grade apochromatic triplet refractor optical tube assembly. Operating at an f/8.0 focal ratio with a 1240mm focal length, this 155mm (6.10 in) clear aperture instrument achieves a 0.75 arcseconds theoretical resolving power and reaches magnitude 13.7, collecting photons for high-resolution planetary video astronomy, true color-free deep-sky astrophotography, and double star analysis.

The optical system features an air-spaced Super APO triplet objective housed in a temperature-compensated CNC lens cell, treated with broadband fully multi-coated (FMC) layers with an unobstructed 0% central profile. Built inside an aluminum chassis extending from 1100mm retracted to 1290mm extended with a 190mm outer dew shield diameter, the tube supplies 190mm of back focus from the rear mechanical thread. Supported by an oversized 3.7-inch heavy-duty dual-speed rack-and-pinion focuser with M92 and M68 rear threads and an integrated 360-degree rotator, this 13.50 kg (29.76 lbs) optical tube illuminates a 44mm full-frame image circle when paired with dedicated correctors.

Key Features of TS Optics CD-APO Deluxe AP 155/1240 OTA

Engineered for permanent observatory installations and high-resolution planetary imaging, this 155mm triplet refractor couples an Ohara FPL-53 element with a massive 3.7-inch rack-and-pinion focuser. Heavy-duty CNC tube rings, a top utility carrying handle, and a 75mm Losmandy-style dovetail bar ensure complete mechanical stiffness under demanding imaging payloads.

• 155mm (6.10 in) clear aperture with 1240mm focal length and f/8.0 optical speed
• Air-spaced Super APO triplet objective with Ohara FPL-53 and German Schott mating glass
• Broadband fully multi-coated (FMC) anti-reflection coatings with 0% central obstruction
• 3.7-inch heavy-duty dual-speed rack-and-pinion focuser 1:10 with M92/M68 threads and rotator
• Generous 190mm mechanical back focus distance measured from rear mechanical thread
• Corrected 44mm full-frame image circle when paired with dedicated flattener or reducer
• Heavy-duty CNC tube rings with 75mm Losmandy-style dovetail bar and top carrying handle
• Retractable dew shield, 2-inch adapter, and 1.25-inch visual back adapter included

Ohara FPL-53 & Schott Deluxe Triplet Optics

An Ohara FPL-53 Super ED center lens mated with precision German Schott elements inside a temperature-compensated CNC cell controls chromatic dispersion and spherical aberration across broad spectral bands. The unobstructed 155mm clear aperture maximizes contrast on delicate lunar rilles and planetary cloud bands, supporting practical visual magnifications from 22.1x up to 310x.

Massive 3.7-Inch Dual-Speed Drawtube & M92/M68 Threading

Holding large-format monochrome cameras, filter wheels, and off-axis guiders requires drawtube rigidity without mechanical flexure under load. The 3.7-inch rack-and-pinion focuser features a 1:10 micro-reduction drive, M92 and M68 threaded interfaces, and a 360-degree field rotator for framing target compositions. Heavy CNC rings and a Losmandy dovetail plate provide solid vibration dampening on observatory mounts.

• 3.7-inch heavy-duty rack-and-pinion focuser with 1:10 micro-reduction for smooth focusing control
• Dual M92 and M68 threaded connections with 360-degree rotator for flexure-free imaging trains
• Heavy-duty CNC mounting rings with Losmandy dovetail bar for maximum torsional stability

TS Photoline Deluxe Triplet Series Warranty

The TS Optics CD-APO Deluxe AP 155/1240 OTA is backed by a 2-year limited warranty against material and manufacturing defects. The complete factory package contains the 155/1240 Triplet OTA, retractable dew shield, heavy CNC tube rings, Losmandy dovetail bar, top carrying handle, and 2-inch and 1.25-inch adapters.