The SVBONY SV222 1.25″ 45-degree Correct-Image Diagonal is designed primarily for terrestrial and daytime refractor use, delivering a fully upright, non-reversed image with a comfortable 45° viewing angle. It is ideal for landscape, wildlife, and general daytime observation, while remaining suitable for casual astronomical viewing.

Key Features

• Correct-Image Erect Prism
  Produces a right-side-up, left-to-right correct image, making it ideal for terrestrial and daytime observing.
• 45° Comfortable Viewing Angle
  The 45-degree design is especially well suited to land-based observing, reducing strain when viewing objects closer to the horizon.
• Fully Multi-Coated & Phase-Coated Optics
  FMC and phase coatings enhance contrast, sharpness, and light transmission for bright, clear images.
• Precision All-Metal Construction
  CNC-machined aluminium alloy body with black anodised finish ensures durability and long-term stability.
• Secure Eyepiece Clamping
  Brass pressure ring and oversized chrome thumbscrew firmly secure eyepieces without scratching.

45° Upright Prism Design

Unlike standard mirror diagonals, the SV222 uses an erecting prism to maintain correct image orientation. This makes it especially useful for terrestrial viewing where natural orientation is important.

Optical Coatings & Image Contrast

Fully multi-coated prism surfaces combined with phase coating improve contrast and resolution, helping to preserve fine detail and reduce light loss.

Internal Light Control

A blackened, baffled interior with matte light-absorbing surfaces reduces stray light and internal reflections, resulting in cleaner, higher-contrast images.

Metal Housing & Mechanical Stability

The robust aluminium alloy body provides excellent mechanical rigidity while remaining lightweight, making it suitable for frequent field use.

Eyepiece Clamping & Ease of Use

The brass compression ring distributes clamping pressure evenly, preventing eyepiece damage. The large chrome thumbscrew allows quick and secure tightening, even when wearing gloves.

Accessory Compatibility

• Compatible with all standard 1.25″ eyepieces
• Supports 1.25″ Barlow lenses
• Accepts standard 1.25″ telescope filters
• Designed for refractor telescopes

Typical Use Cases

• Terrestrial and daytime observing
• Wildlife and landscape viewing
• Correct-orientation lunar viewing
• Refractor telescopes requiring upright images

Key Specifications

• Diagonal size: 1.25″
• Viewing angle: 45°
• Optical type: Erecting prism (correct image)
• Optical coatings: Fully multi-coated with phase coating
• Body material: Aluminium alloy
• Eyepiece clamp: Brass compression ring

Compatibility Notes

• Optimised for terrestrial and daytime use
• Correct image orientation (upright, non-reversed)
• Not recommended for fast focal-ratio astrophotography