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Binoculars review

2012-05-02 14:59:59

Tasco Essentials 8x42

The Tasco Essentials 8x42 is one of the cheapest roof prism 42 mm binoculars available on the market - it would be difficult to expect some impressive performance from it. We deal here with Schmidt-Pechan roof prisms coated by aluminum reflective layers. Some of air-to-glass surfaces are covered by simple, onelayer antireflection coatings and some are not covered at all. The producer doesn’t mention any phase coatings on the prisms. The casing is rubberized and waterproof. Buyers get caps, a strap, a cleaning cloth, and a case in the box. The binoculars come with a one-year guarantee.

Tasco Essentials 8x42Tasco Essentials 8x42Tasco Essentials 8x42Tasco Essentials 8x42
Manufacturer:
Tasco
web site
Distribution / Sales:
Militaria
web site
ul. Oławska 16
50-123 Wrocław
 
Basic parameters:
Magnification Lens diameter Angular field of view Prisms Eye relief Weight Price
8x 42mm 123/1000(7o) BaK-4/roof ? mm 729g 299PLN
More information about this product

Results of the review

Real front lens diameter Left:   42+/- 0.05mm
Right:  42+/- 0.05mm
8/8.0
Real magnification 8.05+/- 0.05x 3/3.0
Transmission 61.4+/- 1.5% 5/15.0
Chromatic aberration Medium in the centre, high on the edge. 3/10.0
Astigmatism Moderate. 6/10.0
Distortion The distance of the first curved line from the field centre compared to the field of vision radius: 25% +\- 5% 2/10.0
Coma Appears more or less in the distance of 70% of the field of vision radius and is huge on the very edge. 5.8/10.0
Blurring at the edge of the FOV The blur occurs in the distance of 80% +\- 5% from the field of vision centre. 5/10.0
Darkening at the edge the FOV Average. 2.6/5.0
Whiteness of the image More than a dozen percent of difference between red and blue light. The image is grey-brownish-yellowish. 3/5.0
Collimation Perfect. 5/5.0
Internal reflections
Left: Right:
Tasco Essentials 8x42 - Internal reflections - Left Tasco Essentials 8x42 - Internal reflections - Right
2.9/5.0
Housing Quite big and not especially stylish, looking far from solid to boot. Slippery and smelly rubber padding which comes off near objectives. Rubberized and regulated eyecups. Produced in China. 3.5/8.0
Focusing Significantly big and ribbed central wheel with the working range of 560 degrees. It moves very unevenly, sometimes being heavy to turn sometimes working more loosely. Individual focusing on the right eyepiece done by a comfortable ring which moves the outer lens. 2.3/5.0
Tripod There is an exit hidden beneath a screw which also secures objective caps. 2.5/3.0
Interpupilary distance from 56.8 to 75.7mm 5/6.0
Closest focusing distance 4.05 metres 0.5/2.0
Eyepieces FOV Apparent field of view of 54.4 degrees. 5.5/10.0
Field of view Measured by us amounted to 6.80 +\- 0.03 degrees and it was a bit narrower than stated in the specifications. Not a very impressive field of view for such a class of equipment. 4/8.0
Quality of the interior of the barrels Black but shiny inner tubes. Grey bottom. Some specks of dust on both prisms. 3/5.0
Vignetting
Left: Right:
Tasco Essentials 8x42 - Vignetting - Left Tasco Essentials 8x42 - Vignetting - Right
OL: 4.80%, OR: 3.88%
2.5/8.0
Prisms quality Good quality BaK-4. 8/8.0
Antireflection coatings Bluish on the outer lenses of the objectives and eyepieces (look like single-layer ones). On the prisms and the inner part of the objective there are no coatings. Part of air-to-glass surfaces in eyepieces seem not to be covered as well. Medium intensity. 1.5/5.0
Warranty [years] 1 1/6.0
Final result 90.6/170
53.3%
Econo result 0pkt.
 

Summary


Pros:
  • sensibly controlled astigmatism,
  • moderate coma,
  • prisms made of BaK-4 glass.

Cons:
  • very weak transmission,
  • badly corrected chromatic aberration,
  • high distortion,
  • noticeable light fall-off on the edge of the field of view,
  • truncated exit pupils,
  • ugly and smelly rubber on the padding,
  • focusing wheel has some slack,
  • sharp image from the distance of over 4 meters.


What can be written in the test’s summary of such a pair of binoculars? Is it really necessary to tear apart a piece of equipment which costs just below 100 Euro? The price itself already indicates that the results cannot be good; accordingly the binoculars’ performance is such that you could have tormented it long and hard. We don’t intend to do so. Let’s just focus on a transmission graph, presented below…


It shows unambiguously what class of instrument we are dealing with here. A classic Porro device with the same parameters would have reached a better transmission level even without one single coating. Here, despite single-layer coatings on some air-to-glass surfaces the transmission is still very weak. All of this makes spending alomst 100 Euro on this pair of binoculars a very bad decision. You would make a much better use of that money trying to buy a 8x40 or 8x42 set of Porro binoculars.


Tasco Essentials 8x42 and Fujinon 8x42 MF