William Optics 1.25" Dielectric Diagonal
Superb quality 1.25" Dielectric coated diagonal.

Much better performance than low cost mirror or prism diagonals.

Technical specs:

• Ultra High Dielectric 99% reflectivity
  
• Precision 1/10 lambda surface with 10mm-thick mirror.
  
• Barrel threaded to fit a variety of filters.
  
• Weight : 210 g