Binoculars review

Hawke Endurance II 10x42

Hawke Endurance II 10x42
6 December 2010
The Endurance II series is a set of binoculars with a 10x magnification and front lenses with a diameter of 42 mm. According to the producer it is a perfect daytime instrument. Good optical properties were reached because several technologies have been integrated here: the lenses and prisms were made of BaK-4 optical glass, characterized by a high degree of light transmittance; the roof prism system was used, where the lenses of an objective and eyepieces are positioned in one line; all lenses inside the binoculars were covered by anti-reflection multi-coatings of silicon dioxide. The device’s hard and completely waterproof body has been designed for performance, durability & comfort, making the binoculars fit to use in any weather conditions. The focus is set by turning one ring for both eyepieces’ viewers. The graduated Twist-up system allows you to adjust the eye relief appropriately. The Endurance binoculars are supplied with comfort neck straps, and eyepieces’ caps.
  • Lornetka Hawke Endurance II 10x42
  • Lornetka Hawke Endurance II 10x42
  • Lornetka Hawke Endurance II 10x42
  • Lornetka Hawke Endurance II 10x42
Manufacturer data


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Magnification Lens diameter Angular field of view Prisms Eye relief Weight Price
10 42 87/1000(5o) BaK-4/roof ? mm 690 g 799 PLN
Results of the review
Real front lens diameter Left:   41.81+/- 0.05 mm
Right:  41.83+/- 0.05 mm
7 / 8.0 pkt
Real magnification 10.6+/- 0.2x 2.5/3.0
Transmission 58+/- 4% 2/25.0
Chromatic aberration Slight in the centre, a bit higher on the edge. 6.3/10.0
Astigmatism Low. 6.2/10.0
Distortion The distance of the first curved line from the field centre compared to the field of view radius: 33% +\- 3% 3/10.0
Coma Slight. 6/10.0
Blurring at the edge of the FOV The blur occurs in the distance of 71% +\- 3% from the field of view centre. 3/10.0
Darkening at the edge the FOV Noticeable but still slight. 3.1/5.0
Whiteness of the image Light yellow. 4.2/5.0
Collimation Perfect. 5/5.0
Internal reflections
Left: Right:
Hawke Endurance II 10x42 - Internal reflections - Left Hawke Endurance II 10x42 - Internal reflections - Right
Not very high but you can see the light escaping by the side through the false pupil
Housing Long and narrow with slippery rubber but still quite solid. Some squelches during moving, eyecups with click-stops, too much grease on the bridge. The eyecups are distinctly too short. 4.2/8.0
Focusing Comfortable central wheel which squelches and is a pain to turn (you can turn it at as many as 1200 degrees). You can’t focus with the inner tubes maximally folded – they block the wheel. The ring on the right eyepiece not very comfortable, with sharp edges; it moves the lens and clicks very loudly, you can easily scare away the animals you observe. 2.2/5.0
Tripod Difficult to access. 2.5/3.0
Interpupilary distance from 59.1 to 76mm 4/6.0
Closest focusing distance 1.8 m 2/2.0
Eyepieces FOV Apparent field of view of 51.4 deg (according to simple formula) and 48.4 deg (according to tangent formula). 4/20.0
Field of view Measured by us amounted to 4.85 +\- 0.03 degrees and it was by 0.15 of a degree narrower than given in the specifications. A very narrow field of view for its class. 4/8.0
Quality of the interior of the barrels Inner tubes dark and matt. Bottom with plenty of scratches. Minimal specks of dust. 4.2/5.0
Left: Right:
Hawke Endurance II 10x42 - Vignetting - Left Hawke Endurance II 10x42 - Vignetting - Right
Truncated right pupil.
OL: 0%, OR: 6.8%.
Prisms quality High class BaK-4. 8/8.0
Antireflection coatings Greenish on objectives and eyepieces. Prisms not covered. Distinct intensity. 3.5/5.0
Warranty [years] 2 2/6.0
Final result
53rd place in our overall ranking of 10x42 binoculars’ test.
96.3 / 190 pkt
Econo result 54th place in the econo ranking of 10x42 binoculars’ test. -14pkt.


  • quite good quality of body,
  • high quality of prisms,
  • correct blackening inside the binoculars,
  • minimum focus already from 1.8 metres,
  • coma, astigmatism and chromatic aberration quite well controlled,
  • good colours rendition.

  • very narrow field of vision, even smaller than provided in official specifications,
  • low transmission,
  • focusing needs a lot of turning of the central wheel,
  • significant distortion,
  • fuzzy image on the edge of the field,
  • slightly truncated the right exit pupil,
  • right eyepiece’s focusing is loud,
  • false pupils,
  • prisms not covered by antireflection coatings.

When the Delta Optical company intended to launch the Forest series binoculars on the market, the prototypes were sent to us for testing. We managed to find a lot of shortcomings, their list was sent to DO and then they forwarded it to their factory in China. As a result the final product lacked most of drawbacks, found by us previously. Imagine now our surprise and amusement when we got hold of the Hawke Endurance II 10X42 binoculars. Although outside it is similar to the Forest it also includes all the flaws of its prototype. After all, the main accusations we had made against the Forest series prototypes concerned clearly visible false pupils, too short eyecups, the right eyepiece’s focus moving too tightly and too loudly, lack of coatings on the prisms and too narrow field of view…

The Hawke Endurance II is nothing less than the Delta Optical Forest before the lifting. If you add that the Hawke is almost two times more expensive, the choice seems to be pretty obvious.