Robust Protective Coating for Longevity.
High-Precision Elliptical Plane Mirror. Features a surface accuracy of PV 1/4–1/6λ and ±0.5mm tolerance for exceptional optical consistency, ensuring sharp, distortion-free reflections.
Multiple Size Options (25mm–54mm). Choose from six precise diameters (/25/30/35/40/42/50/54mm) to fit diverse optical setups.
Astronomical telescope accessories, Barlow lenses (2x, 3x), moon filters, and planetary filters for stunning detail on the Moon, planets, and deep-sky objects.
Astrophotography & Imaging Essentials Capture the cosmos with T-ring adapters, prime focus adapters, field flatteners, reducers, smartphone adapters, and dedicated astronomy cameras.
If you encounter any issues, feel free to contact us by email for prompt support.

Type: Elliptical Plane Mirror

Auxiliary Mirror Size Available: 25/30/35/40/42/50/54mm 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.

25mm secondary mirror, the short side length is 25mm, suitable for 114mm caliber reflective primary mirror.

35mm secondary mirror, short side length 35mm, suitable for 127mm, 133mm, 135mm, 150mm aperture reflective primary mirror.

40mm secondary mirror, 40mm short side length, suitable for 127mm, 133mm, 135mm, 150mm aperture reflector primary mirror.

70mm secondary mirror, short side length 70mm, suitable for 203mm aperture reflector primary mirror.

Packing List:

1pcs sub-mirror

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