TS Optics Diagonal mirror 90° 1.25" (58698)

The TS Optics Diagonal Mirror 90° 1.25" is a premium star diagonal designed for astronomers who demand high image quality and reliable mechanical performance. Unlike many standard diagonals with lower reflectivity and plastic construction, this model features a 99% dielectric-coated mirror, precision 1/12 Lambda optical surface, and a robust CNC-machined metal body. The design ensures full 1.25" field illumination without vignetting and includes a brass compression ring for secure and gentle eyepiece holding. Its thoughtful locking screw placement prevents jamming, even with thick-bodied eyepieces.

This diagonal mirror is an excellent choice for anyone seeking maximum brightness, sharpness, and secure eyepiece handling in their 1.25" telescope setup.

Key Features

• Viewing posture: 90° for comfortable observing

• Reflectivity: Dielectric coating with 99% surface reflection for bright, clear images

• Optical surface quality: 1/12 Lambda for sharp views

• Mirror substrate: BK7 optical glass

• Body: Fully CNC-machined metal for durability

• Telescope connection: 1.25" barrel with filter thread for 1.25" filters

• Eyepiece connection: 1.25" barrel with locking screw and brass compression ring

• Effective optical length: 85 mm

• Field illumination: Full 1.25" field without vignetting

• Correction of vertically reversed image: Yes

• Ring clamp: Yes

General Information

• Type: Deviating optics

• Build: Diagonal mirror