Binoculars with a formula of 10×50 are among the most popular. Such binoculars are suitable for both terrestrial and astronomical observations. In my opinion, 10x is the limit for comfortable observation without using a tripod. The Pentar company kindly provided me with an interesting Pentax SP 10×50 WP binoculars for testing. The binoculars are quite new, the announcement took place in January 2015.
Pentax SP 10x50 WP

Pentax SP 10×50 WP

Specifications are stated:

Type Binoculars with central focusing and “porro” prisms
Lens 2 elements in 1 group
Eyepiece 3 elements in 2 groups (aspherical element declared)
Magnification 10x
Real front lens diameter 50 mm
Field of view from 1000 m 87 m
Exit pupil diameter 5 mm
Eye relief 20 mm
Field of view
5 degrees
Diopter adjustment range +/- 2 D
Focus range From 5.5 m to infinity
Eyecups Retractable with fixation
Height 79 mm
Width 183 mm
Depth 178 mm
Weight
1 kg
Wateroproof
Waterproof when immersed to a depth of 1 m (JIS protection class 6, is not suitable for use under water), nitrogen content of the housing.
Accessories “Tripod adapter N” (69553)
Prism material BaK4
Coating Fully multicoating of all optical elements. Hydrophobic lens coating.
Closest focusing distance 5.5 m
Twilight factor 22.4
Interpupilary distance 57 – 72 mm

Looks tempting, right? Well, let’s get down to testing.
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Saturn, June 17, 2019, 00:14.

The rise of Saturn comes all earlier – now I started shooting it around midnight. Visibility conditions on the planet are improving. Less than a month is left before the confrontation – it will come on July 10, 2019.

Saturn, June 17, 2019, 00:14.

Saturn, June 17, 2019, 00:14.

Equipment:
-Celestron NexStar 8 SE
-Barlow lens cell NPZ 2x
-ZWO ADC
-filter ZWO IR-cut
-camera ZWO 290 MC (33 fps)
Processing: PIPP, Autostakkert (1000 frames from 4000), Registax 6.
Location: Russia, Anapa, backyard.

Mercury, June 16, 2019, 18:48.

In this post I will share my impressions of the daytime shooting of Mercury. I’ll say right away that this shooting turned out to be difficult for me – the scorching Sun, the planet constantly knocking out of sight of the eyepiece, about 20 alignments of the mount for the Sun, a long peering into the bright blue background of the sky really tired me. However, I still managed to catch Mercury and confidently fix its phase. I think that with a quieter atmosphere, some details of the planet’s surface can be captured.

Mercury, June 16, 2019, 18:48.

Mercury, June 16, 2019, 18:48.

Equipment:
-telescope Celestron NexStar 8 SE
-Barlow lens cell Sky-Watcher 2x
-filter wheel
-filter Meade CCD Red
-camera QHY5III178m (7 ms, 120 fps).
The duration of the video is 2 minutes.
Processing: PIPP, Autostakkert (stacking of 2500 frames from 14302, deconvolution).
Location: Russia, Anapa, backyard.

Best single frame without processing.

Best single frame without processing.

The difficulties are as follows:

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