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Considerations in Choosing Tasco Binoculars from OpticsPlanet.com
The brilliance and sharpness of the image you see through a particular binocular
or spotting scope is determined by a number of different factors, including the
interaction of these factors. Magnification, optical coatings and lens diameter are
just a few of the factors influencing how a binocular performs.
However, the single most important criterion in performance will always be the
quality of the optics. Tasco delivers optical excellence through careful
consideration of quality in the glass and lens coatings used, precision
manufacturing processes, and uncompromising quality control.
Please consider the following factors when choosing a Tasco binocular.
Magnification (Power)
Magnification is the degree to which the object being viewed is enlarged. For
example, with a 7x42 binocular, the number 7 represents the "binocular power".
A binocular of the power 7 magnifies an image to seven times the size it would
be when viewed by the normal, unaided human eye. The level of power
affects the brightness of an image, so the lower the power of a
binocular, the brighter the image it delivers will be. In general, i
power will reduce both field of view and eye relief, which are also
discussed here.
Magnification Comparison Chart
Diameter
The objective lenses of binoculars are the front lenses. The diameter of one of
these lenses, given in millimeters, will be the second number describing a
particular binocular. Hence, a 7x42 binocular has an objective lens of 42mm. The
diameter of the lens determines the light gathering ability of the instrument, with
the greater light gathering ability of a larger lens translating into greater detail and
image clarity. This is especially useful in low light conditions and at night.
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Summary of Contents for OpticsPlanet Tasco
- Page 1 However, the single most important criterion in performance will always be the quality of the optics. Tasco delivers optical excellence through careful consideration of quality in the glass and lens coatings used, precision manufacturing processes, and uncompromising quality control.
- Page 2 Doubling the size of the objective lenses quadruples the light gathering ability of the binocular. For instance, a 7x50 binocular has almost twice the light gathering ability of a 7x35 binocular and four times the light gathering ability of a 7x25 binocular.
- Page 3 A binocular’s ability to gather and transmit enough of the available light to give a sufficiently bright and sharp image defines its brightness. The brightness of a binocular also enhances color differentiation in the image observed. R.B.I. (Relative Brightness Index), Twilight Factor and R.L.E. (Relative Light Efficiency) are common indices used in the binocular industry, but are all somewhat flawed in their design and often prove fairly meaningless.
- Page 4 As you see, there are a number of different factors to consider in choosing a binocular. Your Tasco dealer will be able to assist you in making the choice that's right for you and that will bring you years of viewing comfort and pleasure.