What makes the prism in the Baader 2" Star Diagonal "Zeiss Spec"?
A "Zeiss Spec" prism adheres to the extremely high optical quality standards for glass homogeneity, polish, and angular accuracy originally established by Carl Zeiss. This ensures that the prism introduces no discernible optical errors, preserving the image quality produced by your telescope's main objective lens.
Is a prism diagonal like this Baader 2" model better than a dielectric mirror diagonal?
It depends on the telescope. For refractors and SCTs with focal ratios of f/7 or slower, a high-quality prism diagonal like this Baader 2" model often delivers higher contrast and less light scatter than a mirror. For very fast telescopes (f/5 and below), a dielectric mirror is generally preferred as it does not introduce the minor chromatic aberration that can become visible in fast light cones passing through a prism.
How does the 2" ClickLock clamp on the Baader diagonal work?
The Baader 2" ClickLock clamp uses a cam-based system. Twisting the knurled ring engages three hardened steel rollers that securely and evenly press against the eyepiece barrel. This provides a much stronger, self-centering grip than a single thumbscrew, which can push an eyepiece off-axis and mar the barrel.
Will the Baader 2" Star Diagonal Prism work well with my 10" f/10 SCT for viewing Saturn?
Yes, absolutely. An f/10 SCT is an ideal match for this Baader 2" prism diagonal. The long focal ratio means you will not experience any noticeable chromatic aberration from the prism, and you will benefit from the enhanced contrast and thermal stability, which are critical for resolving fine detail like the Cassini Division in Saturn's rings.
Can I use the Baader 2" Star Diagonal for imaging the Pleiades (M45) with my refractor?
Yes, you can. The high reflectivity of the BBHS coatings and the secure, non-tilting hold of the 2" ClickLock clamp make it suitable for imaging. For critical, wide-field imaging of star clusters like the Pleiades (M45), ensure your refractor is f/7 or slower to get the best performance from the prism design.
Since this Baader 2" diagonal is discontinued, how do I care for the BBHS coatings?
The BBHS coatings are very durable due to the dielectric overcoat. You can clean the prism surface just as you would a high-quality mirror or refractor lens. Use a gentle air puffer to remove dust, and if necessary, use a pure cleaning solution (like isopropyl alcohol or a dedicated optical cleaner) with a clean microfiber cloth. Avoid harsh chemicals or abrasive materials.
