Tecnosky Apochromatic refractor AP 90/540 OWL Triplet OTA (71207)

The Tecnosky Apochromatic Refractor AP 90/540 OWL Triplet OTA is a portable, high-performance telescope designed for advanced astronomers and astrophotographers. Its triplet lens system, featuring a central Ohara FPL55 fluoride glass element, delivers excellent color correction and sharp, high-contrast images. The lightweight aluminum tube, retractable dew shield, and compact size make it easy to transport, even fitting into airplane luggage. With a precision focuser, integrated field rotator, and compatibility with full-frame cameras, this telescope is ideal for both visual observation and astrophotography of the Moon, planets, and deep sky objects.

Optics

• Type: Refractor

• Optical Design: Apochromat

• Aperture: 90 mm

• Focal Length: 540 mm

• Focal Ratio: f/6.0

• Resolving Capacity: 1.53 arcseconds

• Limiting Magnitude: 12.3

• Light Gathering Power: 170x compared to the human eye

• Maximum Useful Magnification: 180x

• Lens Design: Triplet with central Ohara FPL55 element

• Tube Material: Aluminium

• Tube Weight: 4.8 kg

• Tube Diameter: 101 mm

• Carrying Length: 480 mm

• Tube Length: 520 mm (with dew shield)

• Stray Light Baffles: Yes

• Tube Construction: Full tube

• Lens Edges: Blackened

• Coating: Fully Multi-Coated (FMC)

• Optical Measurement Report: Strehl value of at least 0.95

Focuser

• Eyepiece Connection: 2"

• Type: Gear rack

• Free Aperture: 72 mm

• Fine Focus Ratio: 1:10

• Rotating: Yes

• Auxiliary Thread for Adaptations: Yes

Mount

• Mounting Type: No mount included

• GoTo Control: No

• Type: Optical Tube Assembly (OTA)

Included Accessories

• Eyepiece Adapter: 2" / 1.25"

• Prism Rail: Vixen-Style (also compatible with Losmandy style)

• Tube Clamps: Yes

• Dew Shield: Yes (retractable)

• Transport Case: Yes

• Deviating Optics: No

• Finder Scope: Not included

• Carrying Handle: Yes (also for mounting accessories)

• Finder Base: Vixen/Skywatcher Level

• Certificate: Included

General

• Series: Owl

• Total Weight: 4.9 kg

Area of Application

• Astrophotography: Yes (very good)

• Moon & Planets: Yes

• Nebulae & Galaxies: Yes

Recommended For

• Beginners: Not recommended

• Advanced Users: Yes

• Observatories: No

Additional Notes

• Optional 0.8x flattener/reducer is available to achieve a fast focal ratio of f/5 for astrophotography.

• All lenses are blackened at the edges and FMC coated for improved contrast and reduced stray light.