Binoculars review

Leica Trinovid 10x42 BN

Leica Trinovid 10x42 BN
22 April 2010
The Trinovid binoculars series consists of roof prisms models with the following parameters: 8x20, 10x25, 8x32, 10x32, 7x42, 8x42, 10x42, 8x50, 10x50 and 12x50.

The Trinovid binoculars’ objective lenses consist of four lenses made of the highest quality optical glass, which have undergone an exceptionally precise and long-lasting grinding process. The lenses are coated with modern HDC antireflection multilayer coatings which are harder than glass, enhancing contrast and damping down flares. The BN series models are nitrogen-filled so fogproof in changeable humidity and temperatures conditions.

The binoculars’ barrel is made of die-cast aluminum exceptionally resistant to temperature changes. An anti-skidding, elastic armour protects the barrel against mechanical damages and ensures comfortable usage in all climatic conditions, The housing is completely sealed so the device is submersible down to a depth of five meters. The Trinovid series binoculars are equipped with a central multi-function focusing mechanism with the integrated dioptre correction (doesn’t apply to the smallest models).

  • Lornetka Leica Trinovid 10x42 BN
  • Lornetka Leica Trinovid 10x42 BN
  • Lornetka Leica Trinovid 10x42 BN
  • Lornetka Leica Trinovid 10x42 BN
Manufacturer data


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Magnification Lens diameter Angular field of view Prisms Eye relief Weight Price
10 42 110/1000(6.3o) BaK-4/roof 13.9 mm 890 g 5299 PLN
Results of the review
Real front lens diameter Left:   41.98+/- 0.05 mm
Right:  42+/- 0.05 mm
8 / 8.0 pkt
Real magnification 9.85+/- 0.2x 3/3.0
Transmission 87+/- 3% 14.5/25.0
Chromatic aberration Slight in the centre and at the edge. 7/10.0
Astigmatism Very low. 8.2/10.0
Distortion The distance of the first curved line from the field centre compared to the field of view radius : 51% +\- 3% 5.5/10.0
Coma Slight. 7.3/10.0
Blurring at the edge of the FOV The blur occurs in the distance of 82% +\- 4% from the field of view centre. 6/10.0
Darkening at the edge the FOV Negligible. 4.6/5.0
Whiteness of the image Noticeable cream-yellow. 3.6/5.0
Collimation Exemplary. 5/5.0
Internal reflections
Left: Right:
Leica Trinovid 10x42 BN - Internal reflections - Left Leica Trinovid 10x42 BN - Internal reflections - Right
Housing Very compact and solid, with significant weight. Comfortable to hold and to look through. The eyecups have no in-between position – they can only be either extended or collapsed. 7.3/8.0
Focusing Comfortable central screw with a pull-out click stop. By pulling out and pressing you can sometimes change the sharpness. Nothing moves outside. 4.2/5.0
Tripod You can buy an additional tripod mount. 2/3.0
Interpupilary distance from 55.3 to 74.8mm 5/6.0
Closest focusing distance 2.4 m. 1.5/2.0
Eyepieces FOV Apparent field of view of 61.3 deg (according to simple formula) and 56.3 deg (according to tangent formula). 11.5/20.0
Field of view Measured by us amounted to 6.22 +\- 0.04 degrees and was minimally lower than that in the specifications. 6.5/8.0
Quality of the interior of the barrels Black and matt. Several small specks of dust and one quite large on the prisms. A hair glued to an inner tube!!! 3.5/5.0
Left: Right:
Leica Trinovid 10x42 BN - Vignetting - Left Leica Trinovid 10x42 BN - Vignetting - Right
Perfect and round exit pupils.
OL: 0.0%, OR: 0.0%.
Prisms quality High class BaK-4. 8/8.0
Antireflection coatings Yellow-pink-green on objectives. Yellow on prisms. Yellow-orange on eyepieces. Low intensity. 5/5.0
Warranty [years] lifetime 6/6.0
Final result
9th place in the overall ranking of the 10x42 binoculars test.
146 / 190 pkt
Econo result 44th place in the econo ranking of the 10x42 binoculars test. -5pkt.


  • very solid housing, convenient to hold,
  • good transmission,
  • very low astigmatism,
  • slight coma,
  • chromatic aberration quite well-corrected,
  • negligent light fall-off at the edge of the field,
  • high quality of prism and coatings,
  • almost imperceptible inner flares,
  • perfectly circular exit pupils clearly seen in the black background,
  • good warranty conditions.

  • whiteness rendition could have been better.

The binoculars virtually without faults, although, taking into account the price, you could expect better results when it comes to the sharpness of the field at its edge, the distortion correction or the whiteness rendition.