TS-Optics 20" f/4 Lightweight Newtonian Primary Mirror with conical back

TS 20" f/4 Primary Newtonian Mirror with conical back, lightweight construction

This parabolic Newtonian primary mirror satisfies with a particularly smooth and precisely processed surface. We recommend this mirror especially for self-construction of a high-quality Newtonian telescope, but also for upgrading an existing telescope.

The special conical shape of the mirror

The mirror substrate of common Newtonian mirror systems is flat at the rear side. The curvature of the front side of the mirror causes different thickness from the center to the edge. This primary mirror is convex at the back side. This design offers a couple of advantages:

With only 11 kg, the mirror is significantly lighter than comparable mirrors.

Cooling takes place more rapidly, as the thinner mirror substrate adapts faster to the ambient temperature.

The deformation effects during the cooling phase, caused by different thickness from center to edge, are almost non-existent.

Thanks to the optional primary mirror cell HSZONTC16 from TS, mounting into different tubes is as easy as with a standard mirror.

If you want to have your mirror checked by a tester of your choice, we will gladly provide you with our recommendation.