TECNOSKY Apochromatic AP 70/478 Quadruplet Flat-Field (OTA)

The Tecnosky Flat Field 70 Lanthanum is a compact, high-quality apochromatic refractor designed to deliver excellent optical performance in both deep-sky photography and terrestrial observation. It is an Apo ED quadruplet with 70 mm aperture and 478 mm focal length (f/6.8), equipped with special Lanthanum glass and an integrated field corrector before the focuser.

This advanced optical configuration guarantees very effective color correction, minimizing aberration over the entire visible spectrum, and at the same time ensures a perfectly flattened field up to 32 mm in diameter. The telescope is therefore perfectly compatible with cameras equipped with large-format sensors such as APS-C, making it an ideal tool for wide-field astrophotography with reflex, mirrorless or cooled astronomical cameras.

Thanks to its compactness and lightness (only 2.5 kg in weight and 310 mm in length with retracted lens hood), the Tecnosky 70 can be easily transported and also used as a high-performance spotting scope for nature observations.

Main technical features:

• Optical scheme: ED 70/478 mm quadruplet apochromatic refractor with lanthanum glass
• Integrated field corrector: Flattener positioned before the focuser, for a correct 32 mm field
• Optical treatment: FMC multi-layer anti-reflective coating on all surfaces
• Optical tube: Anodized aluminum construction, with internal diaphragms for containing stray light and sliding lens hood
• Focuser: 2.5″ rack and pinion, 1:10 gear ratio, smooth and precise rotation even under high loads
• Included accessories: 2″ to 1.25″ reducer with brass locking ring, hard case for transport
• Weight: 2.5 kg
• Length: 310 mm with lens hood retracted
• Corrected and illuminated field: 32 mm – ideal for APS-C sensors

The Tecnosky Flat Field 70 Lanthanum is a high-level tool, capable of offering sharp, contrasted and aberration-free images over the entire field of view. Perfect for astrophotographers looking for a compact yet extremely high-performance instrument, it is also an excellent choice for those who want a versatile travel instrument that is ready to use in any context.