The diameter statedin the product title and the technical specification refer to the minor axis of the elliptical mirror.
The secondary mirror is designed for the construction and improvement of Newtonian reflector telescopes. The mirror is coated with an aluminium reflective layer. This is protected by a quartz protective layer against ageing and scratches during cleaning.
The secondary mirror is ready for installation in the optical tube.
- Distance from the base of the holder to the mirror surface: 79 mm
- Base diameter: 58 mm with an M5 internal thread in the centre
- Central mark for easy adjustment with adjustment laser or Cheshire adjustment eyepiece
The secondary mirror is optimised for the offset of f/4.5 Newtons, it can be used from f/4 to f/5.
