Baader Planetarium T-2 Prism Diagonal

Prism diagonals, like this T-2 model, are often preferred for their durability and lack of mirror coatings that can degrade over time. Because this unit uses total internal reflection, it provides excellent light throughput and contrast, making it a reliable choice for high-precision visual observation.

Not directly. This unit features T-2 threaded connections on both sides, which are designed for secure, fixed configurations rather than standard slip-fit eyepiece holders. You will need a T-2 to 1.25-inch eyepiece holder adapter if you intend to use standard eyepieces.

Binoviewers require a significant amount of back-focus to reach focus, and many standard diagonals are too bulky to accommodate this. With an optical path length of only 35mm, this Baader prism minimizes the distance light must travel, significantly increasing your chances of reaching focus without needing a Barlow lens.

Yes, the T-2 threaded connections provide a rigid, non-slip interface that is ideal for astrophotography setups. It ensures your camera or imaging train remains securely attached and perfectly aligned, which is critical for long-exposure stability.

The 32mm clear aperture is well-suited for most standard 1.25-inch eyepieces and many planetary imaging cameras. However, if you are using wide-field 2-inch eyepieces or large-sensor cameras, you may experience some vignetting at the edges of the field of view.