PLEASE NOTE: The Baader T-2 90-deg Prism Diagonal (with Zeiss Prism) consists of a diagonal body with prism only. It is provided as a basic component, without any nosepiece or eyepiece holder. It incorporates standard T-2 threads at the input (female T thread on the telescope side) and output (male T thread on the eyepiece side) faces. This permits the diagonal to be used as a compatible component along with the other Baader Planetarium T-2 adapters and accessories.
Baader Planetarium has just expanded their innovation in star diagonals. Now, the mid-size, flexibility, and cost of the T-2 Prism Diagonal make this the ultimate diagonal for high power planetary viewing, or in systems where back-focus or space is limited and a full aperture 2" diagonal will not work or is not flexible enough. One of the key features of T-2 diagonals - be it prisms or mirrors - is the large free aperture and the flexibillity to directly adapt onto almost any telescope system, without the bottleneck of a 1.25" barrel size which may cause vignetting in long focal length 1.25" eyepieces or when working with a binoviewer on top of the diagonal. That is precisely why Baader offers the body of all their T-2 System diagonals without adapters.
The Baader Planetarium T-2 Prism Star Diagonal is easily the finest prism star diagonal available today. The right angle prism is produced by Zeiss and is the identical prism that Zeiss supplied for use with their exquisite APQ telescopes. The famous Baader Planetarium 7-Layer Multi-Coatings ensure the image is bright and contrast and the oversized prism provides an oversized full clear aperture of 34mm / 1.34".
Like all the Baader Planetarium products, the mechanical quality and finish are superb. The precision machined aluminum housing provides a stress-free mounting and precise location for the prism, unlike the typical weak plastic or crudely cast housings found on lesser diagonals. Extremely low scatter and high contrast images are the hallmark of this prism diagonal. The end result is a lifetime diagonal that matches or exceeds the brightness and image quality of the finest mirror star diagonals. Users of fine refractors over f/7 as well as SCT users have found that the Baader Planetarium T-2 Prism Star Diagonal provides the sharpest and highest contrast images they have seen from any star diagonal, mirror or prism.
Modular T-2 System Design: The design of the T-2 Prism Diagonal enables it to be configured to exactly suit your needs. The input and output T-2 threads integrate with the full range of Baader Astro T-2 System components and other T threaded adapters. The telescope side can hence be configured to fit in 2" or 1.25" focusers, as well as directly on telescopes with specific threads such as original M44 Zeiss threads, Vixen OTAs or Russian Maks. The eyepiece side can be used with Baader's quick change ring #6 in order to mount the Mark V binocular viewer instead of an eyepiece (in order to achieve the shortest possible backfocus distance between telescope and binocular viewer) or alternatively mount 1.25" (not 2") eyepiece holders. It is also the perfect diagonal for use with the Baader / Zeiss Giant Binoviewer (replaces the normal prism diagonal). Not just a visual accessory, this diagonal also integrates well into digital imaging applications. The effective optical path length of the base T-2 Prism Diagonal with Zeiss Prism is 41mm.
Weight = 5.3oz. (150g)
Baader part numbers: 2456095 and T2-01B