Tecnosky Apochromatic refractor AP 70/478 quadruplet flat-field OTA (73625)

The Tecnosky AP 70/478 Quadruplet Flat-Field OTA is a high-performance apochromatic refractor designed for advanced users, especially those interested in astrophotography and detailed visual observation of the Moon, planets, and deep-sky objects. Thanks to its quadruplet lens design and integrated field corrector, this telescope delivers sharp, flat images across a 32 mm field, making it ideal for wide-field imaging. Its lightweight build and compact size make it easy to transport, while the precision Crayford focuser ensures smooth and accurate focusing. This model is not recommended for beginners or nature observation, but it excels in advanced astronomical applications.

Optical Specifications

• Type: Refractor (Apochromat)

• Lens Design: Quadruplet with integrated corrector

• Aperture: 70 mm

• Focal Length: 478 mm

• Aperture Ratio: f/6.8

• Resolving Capacity: 1.64 arcseconds

• Limiting Magnitude: 11

• Light Gathering Capacity: 100 times the human eye

• Maximum Useful Magnification: 140x

• Tube Weight: 2.5 kg

• Carrying Length: 310 mm

• Optical Coating: Fully Multi-Coated (FMC)

• Tube Construction: Full tube

• Fully Corrected Field: 32 mm

• Stray Light Baffles: Yes

Focuser

• Type: Crayford

• Eyepiece Connection: 2"

• Ring Clamp: Yes

• Fine Focusing: 1:10 gear reduction

• Rotating Focuser: Yes

Mount

• Type: Optical Tube Assembly (OTA) only

• Mounting Type: No mount included

Included Accessories

• Finder Scope: Not included

• Tube Clamps: Yes

• Prism Rail: Vixen-Style

• Dew Shield: Yes

• Eyepiece Adapter: 2" / 1.25"

• Carry Case: Yes

Area of Application

• Astrophotography: Yes (very good)

• Moon & Planets: Yes

• Nebulae & Galaxies: Yes

• Nature Observation: No

• Sun: No (only with appropriate Sun filter)

Recommended For

• Beginners: No

• Advanced Users: Yes

• Observatories: No

This telescope is best suited for experienced astronomers looking for a portable, flat-field refractor for advanced imaging and detailed observations of celestial objects.