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If what you are looking for is the highest achievable brightness, contrast and sharpness during critical observations with high-end instruments, WO 90° 2" mirror Dielectric star Diagonal is your choice.
We do not stop at great looks and astronomical optical performance!

Carbon Fiber 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.

Inside diameter (48mm): threaded to fit a variety of filters.

Weight : 470 g