TS Optics Apochromatic refractor AP 90/540 OTA (73973)

The TS Optics Apochromatic Refractor AP 90/540 OTA is a high-quality optical tube assembly designed for advanced amateur astronomers and astrophotographers. Manufactured by TS Optics, a brand under Teleskop-Service, this refractor offers excellent image sharpness and color correction thanks to its apochromatic triplet lens design. With a compact and robust build, it is well-suited for deep-sky observation, lunar and planetary viewing, and astrophotography. The telescope is supplied as an optical tube only (OTA), so you can pair it with your preferred mount and accessories.

Optical Specifications

• Type: Refractor (Apochromat)

• Aperture: 90 mm

• Focal length: 540 mm

• Aperture ratio: f/6

• Resolving capacity: 1.53 arcseconds

• Limiting magnitude: 11.6

• Light gathering capacity: 170 times the human eye

• Maximum useful magnification: 180x

• Lens design: Triplet

• Coating: Fully Multi-Coated (FMC)

• Stray light baffles: Yes

• Tube construction: Full metal tube

• Tube diameter: 105 mm

• Tube weight: 4.6 kg

• Carrying length: 445 mm

• Dew cap diameter: 121 mm

Focuser

• Type: Rack and pinion

• Eyepiece connection: 2"

• Camera-side threaded socket: M63

• Free aperture: 64 mm

• Motorized option: Available

• Gear reduction: Yes

• Adjustment range: 95 mm

• Rotating focuser: Yes

• Load capacity: 6 kg

• Ring clamp: Yes

Mount and Accessories

• Mount type: OTA (no mount included)

• Prism rail: Vixen-Style

• Carrying handle: Yes

• Transport case: Yes

• Finder base: Vixen/Skywatcher Level

• Eyepiece adaptor: 2" / 1.25"

• Tube clamps: Yes

• Test protocol: Included

• Dew shield: Included

Application Areas

• Astrophotography: Suitable

• Moon & Planets: Suitable

• Nebulae & Galaxies: Suitable

• Nature Observation: Not recommended

• Solar observation: Only with an appropriate solar filter

Recommended For

• Beginners: Not recommended

• Advanced users: Recommended

• Observatories: Not recommended

This telescope is ideal for users seeking high optical performance in a portable package for advanced astronomical imaging and visual observation.