The Baader 1.25" T2 Erecting Prism is a high quality prism diagonal observation with 1.25" eyepieces and is ideal for the Baader MaxBright Binoviewer.
Unlike most low-cost erecting prisms which only have 19mm of free aperture, the Baader 1.25" prism has a much larger 32mm of free aperture. The prism has Baader's High Transmission Multi-Coatings for high contrast and stray light suppression.
Both telescope- and eyepiece-side barrels can be unscrewed to reveal T2 (M42 x 0.75) threads for applications where backfocus is limited such as binoviewers. The 32mm free aperture makes it especially suited for use with the MaxBright II with 27mm prisms. For larger apertures such as the Mark V giant binoviewer, the T2 BBHS Prism Diagonal BA2456095 is recommended.
|Optical design||Star diagonal prism
|Reflection surface||High transmission multi-coating (HT-MC)
|Image orientation||Erect image, mirror inverted
|Clear aperture||32 mm|
|Connection telescope side
||1.25" barrel, M42 x 0.75 (T2) female thread
|Connection eyepiece side
||1.25" clamp, M42 x 0.75 (T2) male thread
In fact, it is the 2nd one. This is perfect size for my needs with the MaxBright II binoviewer. What I like about Baader (apart from usual good quality) is the ability to reconfigure every thing to need. So the two have different GPCs inserted ready for use in whichever scope I've got set up.