Tecnosky AG70 F/5 V2 Apochromatic Quadruplet Refractor

Tecnosky AG70 F/5 V2 Apochromatic Quadruplet Refractor

Overview

The Tecnosky AG70 V2 is a 70mm f/5 apochromatic quadruplet refractor featuring a Petzval design with Lanthanum and FPL-53 glass elements. This configuration delivers a 45mm flat field, making it suitable for full-frame sensors without the need for an additional field flattener.

The aluminum tube includes internal baffles to suppress stray light. The 2.5" rack-and-pinion focuser, made of magnesium alloy, supports loads up to 3 kg and features a 1:10 micro-reduction and a rotatable M48x0.75 thread, allowing the use of 2" filters.

Technical specifications

• Optical design: Petzval apochromatic quadruplet

• Aperture: 70 mm

• Focal length: 350 mm

• F-ratio: f/5

• Glass elements: Lanthanum and FPL-53

• Flat field: 45 mm (full-frame compatible)

• Optical coating: Fully Multi-Coated (FMC)

• Focuser: 2.5" rack-and-pinion in magnesium alloy, 1:10 micro-reduction, rotatable M48x0.75 thread

• Load capacity: up to 3 kg

• Weight: 3.94 kg (including rings and dovetail)

• Included accessories:

  • CNC mounting rings

  • Vixen-style dovetail bar

  • Carrying handle

Optical performance

• Astrophotography: 45mm flat field suitable for full-frame sensors without additional field flattener.

• Recommended use: Wide-field imaging, extended nebulae, dense star fields.

• Compatibility: Full-frame DSLR cameras, CCD/CMOS cameras with sensors up to 45mm diagonal.

Mount compatibility

With a weight under 4 kg, the Tecnosky AG70 V2 is compatible with light to medium mounts:

• iOptron: SkyGuider Pro, CEM25, CEM40, GEM45, HAE29, HEM27

Key features

• Petzval quadruplet design with Lanthanum and FPL-53 glass

• 45mm flat field, ideal for full-frame sensors

• Robust 2.5" focuser with integrated field rotator

• Compact and lightweight tube for easy transport

• No need for additional field flattener