Binoculars with a magnification of 10x, in my opinion, are the ultimate for handheld observation. Magnification over 10x already require an support, tripod or built-in image stabilizer. Binoculars of the 10×42 format are in stable demand, they are noticeably lighter and more compact than binoculars 10×50, but they have a greater magnification than similar ones in weight and dimensions of 8×42. However, making a good roof binocular is not an easy task. My attention was drawn to one of the top Olympus binoculars – 10×42 EXWP I. The binoculars were released a long time ago – the mentions I found go back to 2003. I was unable to find a press release on the release of this binoculars on the Olympus website.

Many of the Olympus models present in stores have been available since 2003 (for example, the Olympus 7×35 DPS I). In 2018, the new Olympus 8×42 Pro and 10×42 Pro binoculars with ED glass, dielectric coating, and improved illumination were presented.

Olympus 10x42 EXWP I

Olympus 10×42 EXWP I

Specifications declared by the manufacturer.
Magnification: 10x
Prism type: roof with phase correction
Optical scheme: 9 elements in 6 groups
Environmentally friendly lead-free glass
Prism Material: High‑index BaK4 prisms
Coating: Full multi‑coating / Phase coating / UV coating
Aperture, mm: 42
Exit pupil, mm: 4,2
Eye relief, mm: 15
Relative brightness: 17,6
Real field of view, ° : 6
Visible field of view, ° : 60
Field of view at distance 1000 m, m: 105
Minimum focusing distance, m: 3
Dioptric correction: D ±2
Interpupillary distance, mm: 60–70
Focusing type: central
Eyecups: twist-up/down eyepieces
Size: classic
Gas filling: nitrogen
Waterproof/fogproof/dirtproof: yes
Size: 129 x 145 x 53 mm
Weight, kg: 0,66
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I took a little picture of the Sun in the line of hydrogen. At the same time, I tested the new Sky-Watcher AZ-GTi mount – Ыun alignment is possible, tracking without problems.

The Sun in the hydrogen line. October 15, 2019, 12:30.

The Sun in the hydrogen line. October 15, 2019, 12:30.

-Coronado PST H-alpha 40 mm telescope
-Sky-Watcher AZ-GTi mount
-Deepsky IR-cut filter
-QHY5III178m camera
Stacking 250 frames from 1800.

Recently, the Visionking 5×25 wide-angle binoculars came to my test. With a magnification of only 5x, he has a field of view of as much as 15.8 degrees. I looked at this binoculars for a long time, but everything was overcome by doubt. A binocular with such characteristics cannot also be inexpensive – there is always some catch, especially if it is a binocular with roof prisms. Well, it turned out that way, but more on that later. In the meantime, I propose to get acquainted with the miracle of the Chinese optical industry.

Binoculars Visionking 5x25

Binoculars Visionking 5×25

The binoculars come in a plain cardboard box with the manufacturer’s logo, as well as some features, in particular, “Fully Coated Optics”.

Declared specifications:
Magnification: 5x
Aperture: 25 мм
Prism system: roof
Prism : BAK4
Focusing system: central
Field of view from 1000 meters:  277 m
Real field of view: 15.8
Exit pupil: 5 мм
Waterproff: Yes
Fog proof : Yes
Nitrogen filling: Yes
Eye relief: 15 mm
Coating : FMC green
Minimum focusing distance: 3 m
Net Weight: 590g

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