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- Allows Evostar 0.85x Reducer/Flatteners to easily adapt to your Evostar ED telescope
- Provides a secure threaded connection
- Allows you to rotate your imaging train 360 degrees without removing anything from the optical system
- Built-in 2" filter mounting to easily place filters into the light path
- Compatible with: Evostar 80ED, 100ED, 120ED and 150ED (not the 150DX).