Baader Planetarium Maxbright 99% T2/T2 90° 32mm Diagonal Prism

Baader Planetarium Maxbright 99% T2/T2 90° 32mm diagonal prism

If you are looking for a diagonal prism that truly does not hold back the performance of your telescope, the Baader Planetarium Maxbright is the choice where no compromises are required. This 90° zenith prism combines exceptional optical precision with a refined mechanical design, making it equally well suited for visual planetary observation and demanding astrophotography.

Outstanding optical performance

At the heart of this prism is a full 32mm aperture with 99% reflectivity thanks to MT-MC (Multi-Transmission Multi-Coating) layers. In practice, this means minimal light loss upon reflection - compared to standard mirror diagonals or cheaper prism solutions, you lose less than one percent of the incoming light. The result is a noticeably brighter and more contrasty image, which you will appreciate especially when observing faint objects or working at dusk.

The accuracy of the optical surfaces reaches lambda/10 and above, guaranteeing a sharp, aberration-free image across the entire field of view - with no spherical or chromatic errors introduced by the diagonal itself.

Mechanical design and integration

The prism is fitted with T2 threads on both the input and output (T2i input, T2a output), making it ideal for direct integration into Baader modular systems or for connecting an astro camera without additional adapters. The optical path length is 35mm - an important parameter when planning precise focusing, especially with refractors that have a limited focuser travel range. The total weight of 160g ensures assembly stability without unnecessarily burdening the focuser.

A trusted standard among diagonal prisms

The Baader Planetarium Maxbright is a recognised standard among diagonal prisms for both visual and photographic use. The German brand Baader Planetarium has decades of experience developing premium astronomical optics and accessories - and the Maxbright prism is a prime example of this. The designers made no compromises in either optical quality or mechanical construction. The result is a product that has long been part of the equipment of amateur and professional astronomers around the world, and that stands up to comparison with far more expensive alternatives.

Whether you are planning high-magnification planetary observation, deep-sky visual work, or astrophotography with a T2-threaded camera, this diagonal prism will be the reliable centrepiece of your optical setup.

Technical specifications