They are a very good binoculars for the
wide field observation and maximum brightness. The exit pupil of 6.7 mm
is ideal to get maximum brightness on faint objects as diffuse nebulas.
The pupil extraction is excelltent: it comfortably allows observations
with the glasses.
But it's under the dark skies that it gives big satisfactions: spectacular panoramas of the Milky Way and its nebulas, great visions of M31 to the extreme borders, nebulas such as North America and Veil are visible magnificently.
Using a pair of UHC filters (from Howie Glatter) also very faint nebulas are visible: California, the Monkey Head, the Flame...
One of the UHC filters that perfectly fit in the rubber of the eyepieces.