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The binoculars Tasco Essentials they offer high-performance optics, a rugged exterior with a waterproof rubber housing. They are very durable, these binoculars are ideal for observation at great distances.
Technical data sheet model 7x35:
Technical data sheet model 7x35:
- Power x objective diameter (mm): 7x35.
- Field of vision (m to 1000m): 157.
- Size is standard.
- Weight (g): 610.
- Focusing system: center.
- The prism system: joint.
- Lens coating: complete.
- Pupillary output (mm): 5.
- The applicant shall provide the following information:.
- Color: black.
- Distance from eye to eyeball (mm): 14.
- Power x objective diameter (mm): 7x50.
- Field of vision (m to 1000m): 120.
- Size is standard.
- Weight (g): 770.
- Focusing system: center.
- The prism system: joint.
- Lens coating: complete.
- Pupil output (mm): 7.
- The applicant shall provide the following information:.
- Color: black.
- Distance from eye to eyeball (mm): 14.
- Power x objective diameter (mm): 10x50.
- Field of vision (m to 1000m): 122.
- Size is standard.
- Weight (g): 770.
- Focusing system: center.
- The prism system: joint.
- Lens coating: complete.
- Pupillary output (mm): 5.
- The applicant shall provide the following information:.
- Color: black.
- Distance from eye to eyeball (mm): 15.
- Power x objective diameter (mm): 16x50.
- Field of vision (m to 1000m): 61.
- Size is standard.
- Weight (g): 796.
- Focusing system: center.
- The prism system: joint.
- Lens coating: complete.
- Pupillary output (mm): 3,1.
- The applicant shall provide the following information:.
- Color: black.
Choosing Binoculars
A quick glance at the binoculars market will make us realize the great variety of different models we have at our disposal, which undoubtedly complicates the choice.
Therefore, we are going to explain below the variables that you should take into account when buying binoculars, so that you can be sure that you are making the right purchase:
- THE MAGNIFICENCE: this refers to the apparent magnification of an object seen through the binoculars, compared to observation without them. Thus with a magnification of 7, an object located at 700 m. appears to be at 100 m.
The ideal magnification is between 7 and 9, since less than 7 is insufficient magnification for outdoor use, while more than 10 increases the movements too much, causing a certain instability in the image so that this type of binoculars are not suitable for use at sea (although they are widely used on land) - OPTICAL DIAMETER: this is the diameter of the objective lens expressed in millimeters, so that the larger the diameter, the brighter the image will appear.
(Para a comfortable use on board a boat), the diameter considered optimal is 50 mm - FIELD OF VISION: defines the width of the observed area at a distance of 1000 m (indicated in meters or degrees).
The higher the magnification, the smaller the field of view - PUPILLAR DIAMETER: corresponds to the small ring that we will observe inside the eyepiece of the binocular. If the pupil diameter is large, it will positively influence the brightness of the image.
Para for use at sea, it is best to choose a binocular with a pupil diameter of 7mm, which is the maximum diameter of the pupil of the eye in night vision, so that there will be no loss of brightness in bad conditions - LENS TREATMENT: untreated lenses lose about 30% of the light received, which undoubtedly affects the brightness and sharpness of the contours of the objects observed.
Lens coatings reduce the loss of brightness while improving colors and filtering out part of the light U.V.
MULTI: special additional coating on certain lenses. Additional advantage: less distortion of colors and/or filtering of U.V. - PRISMS: two types:
- BAK-7: borosilicate prism
- BAK-4: baryum prism. Higher quality glass than BAK-7. They have a wider repair index and allow more light to pass through with less distortion of brightness
Binoculars Tasco 16x50
(Luis Ramon Crossa Fernandez)
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