Binoculars review

Kenko Ultra View OP 8x32 DH

Kenko Ultra View OP 8x32 DH
3 June 2011
The Ultra View series, produced by Kenko, a Japanese company, consists of six roof-prism models with the following parameters: 8x32, 10x32, 8x42, 10x42, 10x50 and 12x50. It is not a homogeneous line-up, though, because the smallest devices are of the “open hinge” design, so fashionable lately, and the rest are not. Apart from that the 32 mm class binoculars come from factories in China and the bigger ones – from Malaysia.

All the binoculars feature Schmidt-Pechan roof prisms made of BaK-4 glass. The producer assures us that all air-to-glass surfaces are covered by high quality antireflection coatings. The glass used in the tested instrument is allegedly eco-friendly i.e. without any arsenic or lead compounds.

The buyer gets caps for objective lenses and a joined rainguard for eyepieces, a case and a cleaning cloth. This pair of binoculars comes with a 10-year-long guarantee period given by the producer.

  • Lornetka Kenko Ultra View OP 8x32 DH
  • Lornetka Kenko Ultra View OP 8x32 DH
  • Lornetka Kenko Ultra View OP 8x32 DH
  • Lornetka Kenko Ultra View OP 8x32 DH
Manufacturer data


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Magnification Lens diameter Angular field of view Prisms Eye relief Weight Price
8 32 140/1000(8o) BaK-4/roof 17.5 mm 560 g 539 PLN
Results of the review
Real front lens diameter Left:   32+/- 0.05 mm
Right:  32+/- 0.05 mm
8 / 8.0 pkt
Real magnification 7.93+/- 0.05x 3/3.0
Transmission 81.9+/- 1% 10/25.0
Chromatic aberration Between low and medium in the centre, medium on the edge. 6.2/10.0
Astigmatism Significant. The stars can be hardly brought to points, distictly sparkling sideways. 3.5/10.0
Distortion The distance of the first curved line from the field centre compared to the field of view radius: 48% +/- 3% 5/10.0
Coma Appears more or less in the distance of 2/3 of the field of vision radius. Between low and medium on the very edge. 7.5/10.0
Blurring at the edge of the FOV The blur occurs in the distance of 65% +/- 3% from the field of view’s centre. 2/10.0
Darkening at the edge the FOV Medium. 3.5/5.0
Whiteness of the image Good. 3.5/5.0
Collimation Noticeably decollimated. 2.5/5.0
Internal reflections
Left: Right:
Kenko Ultra View OP 8x32 DH - Internal reflections - Left Kenko Ultra View OP 8x32 DH - Internal reflections - Right
Very low.
Housing Modelled after the EL Swarovski series. Comfortable to hold and to look through. User-friendly twist-up eyecups with 4 click-stops, made of hard rubber. Very good workmanship, good quality rubber coating; the rubber doesn’t stick out anywhere but it is a bit too slippery. Nothing creaks even under significant pressure. 7.6/8.0
Focusing Very big and comfortable central wheel can be turned through 450 degrees. It is ribbed and rubber-padded. Individual focusing though click-stops on the central wheel. Nothing moves outside. 4.8/5.0
Tripod At the very front of the binoculars. In the 8x32 binoculars’ test we awarded all instruments the same, average value of 1.5 points in this category as a tripod exit is rarely used in this class of equipment. 1.5/3.0
Interpupilary distance from 58 to 78.5mm 5/6.0
Closest focusing distance 2.1 m. 1.5/2.0
Eyepieces FOV Apparent field of view of 59.6 deg (according to simple formula) and 55.1 deg (according to tangent formula). 11/20.0
Field of view Measured by us amounted to 7.52 +/- 0.03 degrees and it was by as much as 0.48 of a degree smaller than stated in the specifications. A typical field for this class of equipment. 3.5/8.0
Quality of the interior of the barrels Inner tubes black and only slightly shiny. Gray bottom. Clean. 4.7/5.0
Left: Right:
Kenko Ultra View OP 8x32 DH - Vignetting - Left Kenko Ultra View OP 8x32 DH - Vignetting - Right
OL: 0.6%, OR: 1.2%
Prisms quality Good quality BaK-4. 8/8.0
Antireflection coatings Green-purple on eyepieces and objectives. Greenish on prisms. Medium intensity. 4.5/5.0
Warranty [years] 10 4.5/6.0
Final result
122 / 190 pkt
Econo result 0pkt.


  • good build quality,
  • chromatic aberration decently corrected,
  • slight coma,
  • very low inner glare,
  • very good blackening inside the binoculars,
  • good quality of prisms.

  • field of view distinctly narrower than that given in the specifications,
  • image focus on the edge of the field decreases sharply,
  • significant astigmatism.

One glance at the outward appearance of the binoculars allows us to say immediately that we deal here with a twin brother of the Vixen New Forest HR 8X32 WP, tested by us not so long ago. What’s interesting, the Kenko is noticeably cheaper than the Vixen in Poland and comes with a longer guarantee period. Keeping in mind very good results of the New Forest model we might think that the Kenko will be even a better option. Unfortunately it is not the case because those two pairs of binoculars differ greatly from each other.

The transmission graph, shown below, is the basic difference.

The Vixen was praised in this category because it featured the transmission of an instrument from a high-end price segment. Inside the Kenko much worse coatings were used so the results are significantly lower – I would say typical for this kind of the equipment. You can clearly understand why the Kenko is distinctly cheaper than the Vixen.

It is not the end of differences, though. The optical construction of both binoculars is perhaps the same as it indicates the field of view, in both models fraudulently narrowed down in the same way; the mechanical construction in the sense of the workmanship of inner parts of the tube is different. The Kenko fared better here because the inside of the binoculars is much better blackened and perhaps it also features additional apertures to limit inner glare. Although it loses more light on the coatings, the Kenko works better against bright light giving much nicer, you can say almost perfect image of exit pupils. The situation in the case of the Vixen was not very bad but significantly worse than here. You can see it clearly comparing the photos of the area near the exit pupils presented in the “Internal reflections” category.

The repetitiveness of the construction and the quality control is quite another question. The Kenko Ultra View OP 8x32 DH, which we tested, was a new device, straight from the carefully wrapped original box. Despite that fact we noticed a distinct decollimation of the binoculars and significant astigmatism. Without testing several other specimens of these binoculars it is difficult to say whether it was a quality control slip-up or the instrument was damaged during the transport.