The SVBONY SV188 1.25″ 90-degree Zenith Mirror Diagonal is a compact, lightweight diagonal designed specifically for refractor telescopes. By redirecting the light path at a right angle, it greatly improves viewing comfort when observing objects high in the sky.

Key Features

• Designed for Refractor Telescopes
  Optimised for use with refractors such as Celestron EQ, Meade Infinity, and similar 1.25″ focusers.
• 90° Comfortable Viewing Angle
  Right-angle design allows relaxed, ergonomic viewing without awkward neck or body positioning.
• Aluminium-Coated Mirror
  Mirror surface delivers bright, clear images with minimal light loss, ideal for visual observing.
• Simple 1.25″ Compatibility
  Slides directly into standard 1.25″ focusers and accepts all 1.25″ eyepieces.
• Lightweight & Easy to Use
  Compact construction makes it well suited to beginner setups and portable telescopes.

Mirror Diagonal Image Orientation

As a mirror diagonal, the SV188 produces a mirror-reversed image (left-right inversion). This is completely normal for mirror diagonals and is standard practice for astronomical observing.

Not Suitable for Reflector Telescopes

Due to its optical length, the SV188 is not compatible with Newtonian reflector telescopes. It is designed exclusively for refractor optical systems.

Compact & Practical Design

The compact housing keeps weight low while maintaining stable alignment, making it a practical upgrade for entry-level and travel refractors.

Typical Use Cases

• Visual astronomical observing
• Moon and planet viewing
• Beginner refractor telescopes
• Lightweight grab-and-go setups

Key Specifications

• Diagonal size: 1.25″
• Viewing angle: 90°
• Optical type: Mirror diagonal
• Compatibility: Refractor telescopes only

Compatibility Notes

• Designed for refractor telescopes
• Produces mirror-reversed images
• Not suitable for Newtonian reflectors