TS Optics 2″ 99% dielectric mirror diagonal with compression ring
Looking for a diagonal mirror that truly delivers - even during the most demanding visual astronomy sessions? The TS Optics 90° dielectric diagonal mirror in 2″ format is the answer for astronomers who refuse to compromise on image quality. It combines exceptional optical performance, a robust all-metal body, and thoughtful accessories - all in one elegant package.
Exceptional optical performance
A dielectric diagonal mirror with 99% reflectivity ranks among the finest optical components available for astronomical telescopes. Unlike standard aluminium or silver coatings, where you lose 10-15% of light, the multi-layer dielectric coating delivers nearly all captured light to your eye. This makes a real difference when observing faint objects - nebulae, galaxies, or fine planetary detail. The mirror surface accuracy reaches 1/12λ (lambda), a parameter reserved for premium optical systems - the image stays sharp, free from aberrations caused by poor surface quality.
All-metal body and secure compression ring
The body of the diagonal is made entirely from metal - no plastics, no compromises. The all-metal construction ensures long service life, thermal stability, and a satisfying feel in use. The compression ring in the clamping mechanism protects eyepieces and camera adapters from damage, providing a firm yet gentle hold without the risk of deforming the barrel of your accessories. Both the input and output diameter of 2″ match the standard used by most modern refractors, reflectors, and catadioptric telescopes in the mid-to-high range.
2″ to 1.25″ reducer with filter thread included
The package includes a 2″ to 1.25″ reduction adapter, extending compatibility to smaller eyepieces and accessories in the 1.25″ standard. This adapter also features a 2″ filter thread, allowing you to conveniently place 2″ astronomical filters into the optical path - for example, narrowband filters for nebula observation, or a lunar filter for comfortable Moon viewing. It is a well-thought-out detail that any astronomer working with a wider filter collection will appreciate.
Who is this diagonal for?
The TS Optics 2″ diagonal with 99% dielectric coating is a worthwhile choice for both beginners assembling their first premium setup and experienced astronomers looking to get the most out of their telescope. Precise optics, solid mechanics, and a well-considered feature set make it an accessory you buy once and use for years to come.
Key specifications
| Parameter |
Value |
| Barrel diameter |
2″ |
| Reflectivity |
99% (dielectric multi-layer coating) |
| Surface accuracy |
1/12λ |
| Deflection angle |
90° |
| Body material |
All-metal |
| Clamping mechanism |
Compression ring |
| Included adapter |
2″ to 1.25″ reducer with 2″ filter thread |
