TS Optics Imaging Star AP 100/580 Quadruplet Apo OTA

Description

Corrected internally to illuminate a flat 44mm sensor circle without external flatteners, the TS Optics Imaging Star AP 100/580 Quadruplet Apo OTA is a dedicated plug-and-play flat-field astrograph refractor. Operating at an f/5.8 focal ratio with a 580mm focal length, this 100mm (3.94 in) aperture instrument yields a 1.16 arcseconds theoretical resolving power and reaches magnitude 12.7, collecting photons across faint extended nebulae and wide-angle sky surveys on full-frame cameras.

The optical system features a Petzval-style quadruplet design combining an air-spaced triplet front objective with an integrated rear optical corrector, treated with broadband fully multi-coated (FMC) layers and an unobstructed 0% central profile. Built inside an aluminum chassis measuring 490mm retracted and 580mm extended with a 125mm outer dew shield diameter, the optical system achieves focus directly via drawtube travel without fixed sensor spacing requirements. Equipped with a 3-inch dual-speed rack-and-pinion focuser, M68x1 and M48x0.75 camera threads, and a 360-degree rotator, this 5.30 kg (11.68 lbs) astrograph maintains edge-to-edge flatness on full-frame sensors.

Key Features of TS Optics Imaging Star AP 100/580 Quadruplet Apo OTA

Built for plug-and-play astrophotography without complex backfocus calculations, this 100mm quadruplet pairs an Ohara FPL-53 triplet with an integrated rear corrector. Its 3-inch rotatable rack-and-pinion focuser, CNC-machined split tube rings, and standard Vixen dovetail plate provide rigid support on equatorial tracking mounts.

• 100mm (3.94 in) clear aperture with 580mm focal length and fast f/5.8 optical speed
• Petzval-style quadruplet optical design with triplet objective and integrated rear corrector
• Ohara FPL-53 Super ED element paired with specialized optical correction glass
• Broadband fully multi-coated (FMC) optical layers with an unobstructed 0% central profile
• Self-flattened internal field achieving focus directly along drawtube travel without spacer rings
• Corrected 44mm full-frame flat field image circle across modern digital camera sensors
• 3-inch dual-speed rack-and-pinion focuser 1:10 with M68x1 and M48x0.75 camera threads
• CNC-machined tube rings, 44mm Vixen-style dovetail plate, and M48 camera adapter included

Ohara FPL-53 & Integrated Rear Corrector Optics

By positioning an optical corrector group inside the rear of the tube, field curvature and off-axis astigmatism are cancelled at the focal plane without altering focal length. The Ohara FPL-53 Super ED element eliminates chromatic fringing around bright stars, while an unobstructed light path supports practical visual magnifications from 14.3x up to 200x.

Heavy-Duty 3-Inch Drawtube & M68/M48 Camera Coupling

Holding heavy camera equipment without drawtube flexure is delivered through a 3-inch rack-and-pinion focuser with a 1:10 micro-reduction gear, an integrated 360-degree manual field rotator, and threaded M68x1 and M48x0.75 camera connections. Weighing 5.30 kg, this optical tube assembly clamps securely onto standard equatorial mount saddles.

• 3-inch dual-speed rack-and-pinion focuser with 1:10 micro-tuning control to eliminate camera sag
• Integrated 360-degree manual field rotator with direct M68x1 and M48x0.75 threaded interfaces
• CNC-machined aluminum tube rings with standard 44mm Vixen-style dovetail mounting plate

TS Imaging Star Flat-Field Series Warranty

The TS Optics Imaging Star AP 100/580 Quadruplet Apo OTA is backed by a 2-year limited warranty against material and manufacturing defects. The complete factory package contains the 100/580 Quadruplet OTA, integrated rear corrector lens, retractable dew shield, CNC tube rings, Vixen dovetail plate, and an M48 camera adapter.