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Binoculars review

Nikon Action VII 10x40 CF

Nikon Action VII 10x40 CF
18 July 2011
Optyczne.pl 
The Action VII CF series consists of the simplest and the cheapest Porro pairs of binoculars which the Nikon company has on its offer. Since the launch for several years the series included models with the following parameters: 7x35, 8x40, 7x50, 10x50, 12x50 and 16x50 and also two pairs of zoom binoculars - 7-15x35 and 10-22x50. As you can notice the offer lacked very popular 10x40 parameters. In 2010 Nikon decided to catch up and the Action VII 10x40 CF model was officially presented.

The producer boasts of prisms made of BaK-4 glass and multilayer antireflection coatings. The binoculars are also supposed to include some aspherical elements. The buyer gets caps, a strap and a case in box. The Action VII series binoculars come with 10-year long guarantee.

Pictures
  • Lornetka Nikon Action VII 10x40 CF
  • Lornetka Nikon Action VII 10x40 CF
  • Lornetka Nikon Action VII 10x40 CF
  • Lornetka Nikon Action VII 10x40 CF
Manufacturer data

Manufacturer:

Nikon
web site

Distribution / Sales:

Nikon Polska
web site

Magnification Lens diameter Angular field of view Prisms Eye relief Weight Price
10 40 105/1000(6o) BaK-4/Porro 10.5 mm 740 g 299 PLN
Results of the review
Real front lens diameter Left:   39.9+/- 0.05 mm
Right:  39.9+/- 0.05 mm
8 / 8.0 pkt
Real magnification 10.89+/- 0.05x 2/3.0
Transmission 83.5+/- 1.5% 10.5/15.0
Chromatic aberration Noticeable in the centre, huge on the edge. 2.7/10.0
Astigmatism Medium. 5.5/10.0
Distortion The distance of the first curved line from the field centre compared to the field of view radius: 57% ± 5% 6/10.0
Coma Appears near 70% of the field of view radius and is a bit higher than medium on the very edge. 6.5/10.0
Blurring at the edge of the FOV The blur occurs in the distance of 70% +\- 3% from the field of view centre. 3/10.0
Darkening at the edge the FOV Slight. 4/5.0
Whiteness of the image Surprisingly good. The transmission curve is perhaps not the highest but very flat in the wide range of the spectrum. 4.8/5.0
Collimation Perfect. 5/5.0
Internal reflections
Left: Right:
Nikon Action VII 10x40 CF - Internal reflections - Left Nikon Action VII 10x40 CF - Internal reflections - Right
Quite light areas near exit pupils.
2.2/5.0
Housing Classic Porro casing with black, smooth rubber padding and ribs in places for your thumbs. Comfortable to hold. A relatively solid casing for such a price. The rubber sticks out a bit near objectives. Rubber, narrow eyecups which can be folded. 6.6/8.0
Focusing Big and comfortable central wheel which moves smoothly. Full turn through 500 degrees. Individual focusing on the right eyepiece moves the whole eyepiece and squelches a lot. The bridge moves evenly but sways sideways a lot. Pressure applied on the eyepieces don’t causes significant defocusing. 2.7/5.0
Tripod There is a comfortable tripod exit. 3/3.0
Interpupilary distance from 56.3 to 73.5mm 4/6.0
Closest focusing distance 2.85 m 1/2.0
Eyepieces FOV Apparent field of view of 63.3 degrees. 7/10.0
Field of view Measured by us amounted to 5.81 +\- 0.04 degrees and it was a bit narrower than that stated in specifications. Typical field of view for this class of equipment. 4/8.0
Quality of the interior of the barrels Inner tubes dark and matt, the bottom and areas near prisms grey. A lot of white glue. Some tiny specks of dust. 3.1/5.0
Vignetting
Left: Right:
Nikon Action VII 10x40 CF - Vignetting - Left Nikon Action VII 10x40 CF - Vignetting - Right
OL: 0.8%, OR: 1.3%
5.5/8.0
Prisms quality Good quality BaK-4. 8/8.0
Antireflection coatings Greenish on the outer elements of eyepieces and objectives. The inner part of the objectives’ elements as well as a part of surfaces in eyepieces and prisms seem to be left uncovered or they have very weak coatings. Medium intensity. 2.5/5.0
Warranty [years] 10 4.5/6.0
Final result
65.9%
112.1 / 170 pkt
Econo result 0pkt.

Summary


Pros:
  • very good colour rendition,
  • good quality of BaK-4 prisms,
  • sensibly corrected distortion,
  • not bothersome coma,
  • slight brightness loss on the edge of the field of vision,
  • long guarantee period.

Cons:
  • significant chromatic aberration,
  • magnification noticeably bigger than declared,
  • slightly truncated exit pupils,
  • a lot of inner flares,
  • significant blur on the edge of the field of vision,
  • lack of coatings on several air-to-glass surfaces.


The result of 112 points which the Nikon Action VII 10x40 CF got in our test, certainly is nothing to boast of but, on the other hand, it doesn’t disgrace this pair of binoculars either. It’s enough to consult our 10x42 class binoculars’ ranking to find out that the Nikon, costing less than 100 USD, is simply unbeatable in its price segment. Only more expensive devices had better scores. The binoculars which price ranged from 50 to 150 USD fared noticeably worse. If you are interested in a relatively handy day pair of binoculars and your price limit is set at 100 USD you should consider buying the Nikon Action VII 10x40 CF very seriously.