Prism binoculars with a magnification of up to 7x represent a separate class of devices. These are compact binoculars with a large field of view and a limited use. Of the fairly well-known models, I can recall offhand soviet БПЦШ 6×30, Bushnell 4×30 Xtra-wide, VisionKing 5×25, Kowa 6×30, Pentax Papilio 6.5×21. How can such “kids” be useful for astronomy lovers? Firstly, the study of constellations. With low-magnification binoculars, one can easily identify faint stars in the constellation, pave the “star track” to search for a nebula or galaxy, and due to the small magnification, shaking hands is almost imperceptible, which greatly increases the convenience of observation and the limited visible magnitude of the binoculars. Well, of course, the observation of wide star fields and the brightest areas of the Milky Way personally gives me great aesthetic pleasure.
Recently on sale I noticed an interesting model – Veber Prima 5×20. It interested me in a small magnification, a sufficiently large exit pupil (4 mm), long eye relief 16.2 mm, and also the declared coating of all optical surfaces. This is a small prism binoculars reverse Porro system. Unlike the roof- and classic Porro binoculars, the reversing binoculars have less distance between the lenses than the interpupillary distance of the eyes. This leads to reduced stereoplasticity (volume) of the image. In some cases, this can even be useful – for example, in a theater, or when observing nearby objects (<1 m). In addition, binoculars with a reduced stereo base are very compact.
The result of another Perseid hunt. For shooting, I decided to get to the village of Anapskaya to the north-east of Anapa. The conditions were not very good. The almost full moon illuminated half the sky. Mosquitoes and dew interfered. There were few meteors. I managed to see a fast and bright green meteor, the trace after which was visible still held for several seconds.
Perseid meteor shower, August 13, 2019, 00:31-01:56 (UTC +3)
-cctv lens2.5 мм f\1.2.
-camera QHY5III178m (bin2 mode, 1528х1024@5fps, 200 ms)
Stacking at StarStax.
Location: Russia, Anapskaya.