Dielectric 2'' Quartz 1/10 Lamda diagonal mirror with a reflection of 99%

If you want to equip yourself with an excellent accessory, for use with high quality instruments, which provides excellent brightness, contrast and sharpness for intensive observing, you should include a William Optics 90°, 2'' dielectric mirror star diagonal (1/10 Lambda).

A first class product at a low price!

Features:

- dielectric coating

- extremely high reflectance of 99%.

- accurate to 1/10 lambda surface, with the 10mm thick mirror.

- 2'' to 1.25'' adapter with brass compression ring.

- inner diameter (48mm): threaded to fit a large range of filters.

- 100% carbon-fibre side-plates

- weight: 470g