Baader 2" Clicklock 90° Star Diagonal with Carl Zeiss Spec Prism # PRISM-2Z 2456117
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Quick Overview
- Precision-engineered star diagonal with Zeiss-spec prism offers minimal light scatter for high-contrast views at high magnification
- Baader BBHS reflective coating on reflective surface of BaK4 prism for maximum reflectivity and long life, and other faces of prism are multicoated for maximum transmission
- Includes 2” threaded removable nosepiece with safety kerf and 2” Clicklock eyepiece holder
- Full 47.5mm clear aperture and 100mm optical path length
- Superb mechanical fit and finish
Product Details
Baader BBHS Technology for Ultra-High Reflectivity and Superior Color and Contrast
Like most prism diagonals, this diagonal relies on total internal reflection at a 45-degree angle 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 2” diagonal with the Zeiss-spec prism employs a Baader BBHS (Broad-Band Hard Silver) coating on the hypotenuse. This hard and long-lived silver coating enhances reflectivity, even at angles other than 45 degrees, so the product has enhanced performance and long life.
This diagonal works well for observing nearly all celestial objects. But since it minimizes scattered light and wavefront error, it’s especially good for high-contrast and high-magnification planetary and double-star observation.
Like all prism-based star diagonals, it has a short optical path length of just 100mm. It exhibits minimal light scatter and provides high contrast images. Its reflective properties do not degrade with age. The prism is mounted in a precisely machined aluminum housing to ensure the glass remains in the correct location and orientation for maximum performance and long life.
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.
ClickLock 2" Eyepiece Holder
The 2" ClickLock non-marring eyepiece holder delivers the same acclaimed simplicity and security as its smaller 1.25" ClickLock cousin. With a quick 20 degree twist of the rubber knurled ring using a convenient fingertip lever, the ClickLock holder clamps 2" eyepieces so securely that you can lift your scope with them. The unique action utilizes 3-point clamping which positively and accurately locks 2" eyepieces without any of the wobbling and misalignment that can occur with single point clamps. With a clear aperture of 47.5mm, this mirror diagonal can handle all 2” eyepieces without vignetting.
The diagonal includes a 2” nosepiece with a safety kerf on the telescope side. The nosepiece includes standard 2” threads for accepting filters. It can also be removed to expose female M55 threads for direct interface to telescopes with or without adapters, depending on the telescope
Specifications:
- Baader diagonal # 2456117
- Weight (kg): 0.513
- Inner Connection (lens side): Thread, M48, M55, 2" (50.8mm)
- Outer Connection (lens side): Barrel, Dovetail ring, S58, 2" (50.8mm)
- Inner Connection (eyepiece/-camera-side): Thread, Clamp, M55, 2" (50.8mm)
- Reflection surface: BBHS coated, Dielectrically protected
- AR-Coating: Phantom Coating Group
- Image Orientation: Erect image, Mirror inverted
- Optical length (mm): 100
- Clamping System: ClickLock
- Inner Diameter / Clear Aperture (mm): 47.5
Other Information
- Country of Manufacture: Germany
