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.
Packing.
Binoculars Pentax SP 10×50 WP comes in a large light cardboard box. No screaming advertising stickers and inscriptions – elegant and ascetic. The set includes protective covers for lenses, a wide cover for eyepieces (“rainguard”), a bag and a belt. Lens caps are held tightly, but for tight fixation of the eyepiece caps, you need to increase the interpupillary distance. There is no belt on the bag itself – it is supposed to carry binoculars with a neck strap. The bag is large, soft, high-quality, with a “Pentax” patch. Made binoculars in China.

Housing.
The binoculars are quite dimensional both in width (due to the stereobase) and in length (due to the long lens tubes), but at the level of similar binoculars with the same formula and scheme. Weight – 1 kg, you can watch for a long time with the hands, but still weighs considerable weight. Grip is convenient, it is pleasant to hold binoculars in hand, rubberized matte finish. The quality of materials no complaints. In the front of the binoculars under the lid hidden thread for tripod adapter. Adjustment screws on the case are not visible – as far as I know, they are hidden under a rubber coating. If you have problems with collimation, it is better to contact the official service center. Yes, by the way, the term of the brand warranty is 30 years.

Optics:
The lens aperture measured by me was 49.9 mm. The lenses are slightly recessed into the housing, the risk of getting their fingers dirty is minimal. The color of glare from lenses and prisms is dark green. Blackening inside matte. The prisms are coated. There are no traces of glue, dust, chips. Fine!

The diameter of the eye lenses is 17.5 mm. The color of the coating – green, blue, colorless (apparently, from the bonding of lenses). The eyepiece lenses are recessed into the housing. The measured field of view of the eyepieces corresponds to the declared – 50 degrees. Near the right eyepiece there is a lever for additional adjustment of diopters. Testing with a flashlight and examining the exit pupils showed good light protection with several small bright areas. Exit pupils are round, barely clipped by a prism.

Eye relief is large – about 20 mm, with screwed eyecup, you can watch with glasses. The eyecups are large, height adjustable rotation with several intermediate positions. Thanks to the cone-shaped shape, the eyecup fits comfortably into the eye socket. The eyecup is extended by 4 and 11 mm.

Focusing.
Focusing is ribbed drum with a rotation range of one and a half turns. Focusing tight. It is possible to fix the point of focus – you need to move the drum away from you. Interestingly, the eyepieces are not held on the bridge, as in most binoculars with a central focus, and are shifted in the tubes inside the binoculars. This has a positive effect on the tightness and dust protection of binoculars, there is also no backlash of the eyepieces when they are pressed. I personally liked this constructive solution. Binoculars with central focusing and full water protection are a unique feature.

Star test.
When testing by the stars, the binoculars showed 2/3 fields in good quality, then the stars blur. There is also a noticeable coma. For such a moderate field of view, image quality could be better. When observing the Moon there are two weak reflections. Collimation is perfect, the eyes do not get tired with a long viewing.

During daytime observations, the image is bright, saturated, contrasting, without distortion of color rendition. In the center chromatic aberration is small, it becomes more noticeable towards the edge. Distortion is almost imperceptible. Vignetting (darkening of the image to the edge) is not detected. After binoculars with roof-prisms, the image is very voluminous due to the extended stereobase.

Summary:
+Excellent build quality and housing
+Dust- moisture- waterproof, impermeability
+Fully multi coating
+Neutral color rendition
+Very small distortion
+Long eye relief
+Excellent blackening of internal surfaces
+30 year warranty.

-Tight focusing drum
-Sharpness across the field could be better.

I recommend this binoculars to people for whom the functionality and all-weather use of binoculars is more important than image quality, namely tourists, travelers, hunters, as well as undemanding observers of the night sky.

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