Baader T-2 90° Deluxe Astro-Grade Amici Prism Diagonal Body # AMICI-DX1 2456130

Our Price: $319.00
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Manufacturer SKU: 2456130
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Baader T-2 90° Deluxe Astro-Grade Amici Prism Diagonal Body # AMICI-DX1 2456130

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  • Baader T-2 90° Deluxe Astro-Grade Amici Prism Diagonal Body # AMICI-DX1 2456130
  • Baader T-2 90° Deluxe Astro-Grade Amici Prism Diagonal Body # AMICI-DX1 2456130
  • Some of the many adapters that can be used with the T-2 Maxbright diagonal (sold separately)

Quick Overview

  • Precision-engineered Amici prism diagonal offers crisp, high-contrast, correct-image views of terrestrial and celestial objects
  • Zeiss-spec Amici prism for precision astronomical quality images even at higher magnifications
  • Configurable with 1.25” and 2” Baader T-2 nosepieces, 1.25” eyepiece holders, and other accessories (not included with this diagonal body) to suit a wide range of telescopes and applications
  • Baader sealed BBHS coatings provide high reflectivity and long lifetime
  • Ideal for correct-image viewing of the Moon, planets, and deep-sky sights
  • Full 31mm clear aperture
  • Superb mechanical fit and finish

Product Details

PLEASE NOTE: This Baader T-2 90-degree correct-image Amici prism diagonal consists of a diagonal body with prism ONLY and includes no nosepiece or eyepiece holder. It has standard T/T-2 threads at the input face (with female T/T-2 thread on the telescope side) and at the output face (with male T thread on the eyepiece side). This lets you add Baader Planetarium T-2 adapters and accessories to configure the diagonal to your needs.

The Amici prism has long been favored as the best choice for producing correctly-oriented images in refractors and Schmidt-Cassegrain telescopes. These prisms are hard to make, however, and they require a much higher level of quality control and manufacturing precision than mirror or prism diagonals. The faces of an Amici prism must be polished smooth and flat at the proper angles to produce symmetrical images without astigmatism. The sharp roof edge of the prism must also be made vanishingly fine to prevent a single prominent diffraction spike in images. These demands on prism quality are the prime reason why even expensive Amici prism diagonals have developed a reputation for poor image quality. And to save cost, many manufacturers use undersized prisms which may cause vignetting.

Baader Planetarium has overcome these challenges to produce what might be the finest Amici prism star diagonal available today. The Zeiss-spec prism has been made to the correct specifications to ensure highest image quality. The finest 7-Layer Multi-Coatings ensure the image is bright and contrasty, and the oversized prism provides the full clear aperture of 31mm, large enough to prevent vignetting with any 1.25” eyepiece. The precision-machined aluminum housing provides stress free mounting and precise location for the prism.

Most prism diagonals rely on total internal reflection within the prism to direct light to the eyepiece. This approach results in high reflectivity without the need to use a reflective coating. However, when relying on total internal reflection, the reflectivity can degrade if dew or dust gets on the surface of the diagonal hypotenuse. That’s why this diagonal employs a Baader BBHS (Broad-Band Hard Silver) coating on the hypotenuse. This silver coating is sealed in a hard dielectric coating for enhanced reflectivity and long life.

When used for terrestrial and astronomical viewing, this diagonal provide crisp, sharp, high-contrast views and low and high magnification without aberrations or image breakdown. The diagonal is perfect for observers who wish to match their view through the eyepiece to astronomical deep-sky charts and lunar maps, or for sketching correctly-oriented planetary detail.

You can configure this diagonal to exactly suit your viewing requirements. The input and output T/T-2 threads integrate with the full range of Baader Astro T-2 System components and other T-threaded adapters. The telescope side can be configured to fit 2" or 1.25" focusers, while the eyepiece side is configurable for 1.25” eyepieces. This diagonal also functions well with the Baader Maxbright BinoViewer and Baader/Zeiss Mark V BinoViewer to provide correctly-oriented binoviewing.

The effective optical path length of this Baader Amici prism diagonal is 47.5 mm. The diagonal weighs just 7.3 oz (206g).

Note: This diagonal body uses a prism made under license for Baader by the same production facility that made this item for Zeiss and to the same exacting Zeiss specifications. This "Zeiss-spec" prism was made for Baader and it is not an actual Zeiss-branded prism.

Manufacturer part number: 2456130.