Baader T2 BBHS-Sitall diagonal mirror - dual T2-threads

One of the best T2 and 1.25" star diagonal mirrors we know

The Baader Maxbright diagonal mirror is more than only a high-quality alternative to other systems. It has the following advantages:

99% reflectivity with dielectrical coatings according to ZEISS company standard

very robust metal body with T2 threads on both sides

excellent optical quality

offers 35 mm clear aperture - significantly more than with standard 1.25" systems

even usable with 2" eyepieces

BBHS silver coating

BBHS Broadband Hard Silver coating with protective dielectric coating ... this coating offers perfect reflection from 400 nm to 2000 nm. You will have to want the best to decided for this diagonal miror.

Silver always had the stigma of quickly tarnishing and aging, and that was true in the past. With the hard silver coating and protective dielectric coating, this is not the case anymore. Like with other coatings from Baader, durability is not an issue anymore. According to Baader, the visual experience is absolutely the best and only comparable to straight viewing without diagonal mirror.

The shortest 2" diagonal mirror we know

This star diagonal allows 2" adaptations if adapters are used.

This makes sense with telescopes who have a short back focus where normal 2" diagonals can´t be used. One example is the Pentax 75 SDHF.

You can use 2" eyepieces up to ca. 40 mm field stop diameter. The picture remains steady. You only have small vignetting on the outer rim of the image.

In oposite, 1.25" diagonals have maximal approx. 27 mm of free aperture. So you gain 30% with the Baader BBHS T2 system.