20/25/28/30/35/40/42/45/ 50/54/60/70/80/90mm Astronomical Telescope Secondary Mirror

20/25/28/30/35/40/42/45/50/54/60/70/80/90mm DIY Newtonian Reflective Astronomical Telescope Secondary Mirror Elliptical Short Axis

Specifications:

Newtonian Telescope Secondary Mirror

Type: Elliptical Plane Mirror

Auxiliary Mirror Size Available: 20/25/28/30/35/40/42/45/50/54/60/70mm for choosing

Tolerance: ±0.5

Surface Accuracy PV: 1/4-1/6λ

Coating: Aluminum Reflection + Protective Film

Short axis: refers to the length of the short side diameter, the surface is coated with aluminum film and protective film.

20mm short axis secondary mirror, short side length 20mm, aluminum coated surface and protective film, suitable for use with 76mm aperture reflector main mirror.

25mm short axis secondary mirror, short side length 25mm, surface aluminized film and protective film, suitable for use with 114mm aperture mirror main mirror.

35mm short-axis secondary mirror, short side length 35mm, surface aluminized film and protective film, suitable for 127mm,133mm,135mm, 150mm, aperture reflection main mirror.

40mm short axis secondary mirror, short side length 40mm, surface aluminized film and protective film, suitable for 127mm,133mm,135mm, 150mm, aperture reflector main mirror.

70mm short-axis secondary mirror, short side length 70mm, aluminum coated surface and protective film, suitable for use with 203mm aperture reflector main mirror.

Package:

1pcs Short Axis Secondary Mirror