If what you are looking for is the highest achievable brightness, contrast and sharpness during critical observations with high-end instruments, WO 90-degree 2" mirror Dielectric star Diagonal is your choice. A premium product at a discounted price!
Top-Notch Performance and brightness
• Aluminum side plate and Ultra high dielectric 99% reflectivity
• Precision 1/10 lambda surface with 10mm-thick mirror
• 2"-1.25" adapter with brass clamping ring included
• Accurate design guarantees constant alignment. No further alignment needed.
• Barrel threaded to fit a variety of 2" (48mm) filters
• Weight: 14.1oz/400g (w/o 1.25" adapter); 17.0oz/480g (w/ 1.25" adapter)