William Optics Fluorostar AP 132/925 Gold OTA

Description

Resolve fine details along the lunar terminator and split close binary systems with the William Optics Fluorostar AP 132/925 Gold OTA high-end professional apochromatic refractor telescope optical tube assembly. Operating at an f/7.0 focal ratio with a 925mm focal length, this 132mm (5.20 in) clear aperture instrument delivers a 0.88 arcseconds theoretical resolving power and reaches magnitude 13.3, collecting photons across faint emission nebulae and resolving delicate planetary structures.

The optical system features an air-spaced Super APO triplet configuration housed in a CNC temperature-compensated lens cell, incorporating an Ohara FPL-53 Super ED center element paired with rare-earth lanthanum mating glasses, treated with ultra-high transmission broadband multi-coatings (STM) with an unobstructed 0% central profile. Built inside an aluminum chassis measuring 780mm retracted and 940mm extended with a 168mm outer dew shield diameter, the tube assembly supplies 170mm of back focus from the rear mechanical thread (55mm standard from M48/M68 flattener threads). Supported by an oversized 3.3-inch heavy-duty dual-speed rack-and-pinion focuser with a built-in 360-degree rotator and gold accents, this 9.00 kg (19.84 lbs) refractor illuminates a 44mm full-frame and medium-format field when paired with dedicated Flat68III or Flat7A correctors.

Key Features of William Optics Fluorostar AP 132/925 Gold OTA

Engineered for high-end professional deep-sky astrophotography, this 132mm triplet refractor couples certified FPL-53 optics with an oversized 3.3-inch rack-and-pinion focuser. Heavy CNC mounting rings, a 75mm Losmandy-style dovetail bar, a gold top saddle handle with an integrated guiding slot, and a patented Bahtinov focus mask cap provide rigid mechanical support under heavy imaging equipment.

• 132mm (5.20 in) clear aperture with 925mm focal length and versatile f/7.0 optical speed
• Air-spaced Super APO triplet objective with Ohara FPL-53 and lanthanum rare-earth glasses
• Ultra-high transmission broadband multi-coatings with certified Strehl ratio of 0.95 or greater
• 3.3-inch heavy-duty dual-speed rack-and-pinion focuser 1:10 with gold accents and 360-degree rotator
• Generous 170mm rear back focus distance (55mm standard from M48/M68 flattener thread)
• Corrected 44mm image circle covering full-frame and medium format with dedicated correctors
• Heavy CNC tube rings with 75mm Losmandy-style dovetail bar and gold top saddle handle
• Patented clear Bahtinov focus mask cap and rotatable visual back included in package

Rare-Earth Lanthanum & FPL-53 Triplet Dispersion Control

The combination of an Ohara FPL-53 center element and rare-earth lanthanum mating glasses in a temperature-compensated cell cancels secondary spectrum chromatic aberration across visible wavelengths. Supported by a factory-certified Strehl ratio of 0.95 or higher, the unobstructed 132mm optical path maximizes contrast on planetary discs and lunar craters, supporting practical visual magnifications from 18.9x up to 264x.

Massive 3.3-Inch Drawtube & 75mm Losmandy Plate

Supporting large-format monochrome cameras, filter wheels, and off-axis guiders without drawtube flexure is delivered through a 3.3-inch rack-and-pinion focuser with a 1:10 micro-reduction gear, an integrated 360-degree field rotator, and an engraved millimeter scale. The 75mm Losmandy dovetail plate and heavy CNC rings provide maximum torsional stiffness on observatory mount saddles.

• 3.3-inch dual-speed rack-and-pinion focuser with 1:10 micro-reduction to eliminate drawtube flexure
• Built-in 360-degree camera field rotator for rapid target framing without losing focus
• Patented clear Bahtinov focus mask integrated into the metal lens cap for precise focus acquisition

William Optics FLT132 Gold Flagship Warranty

The William Optics Fluorostar AP 132/925 Gold OTA is backed by a 2-year limited warranty against material and manufacturing defects. The complete factory package contains the FLT132 Gold OTA, patented Bahtinov focus mask integrated cap, CNC heavy tube rings, Losmandy dovetail bar, top saddle handle, and a rotatable visual back.