translate to greater satisfaction with the product you ultimately select. Lens
coatings range in quality as follows: coated -- fully coated -- multicoated -- fully
multicoated. Coated lenses are the lowest quality and basically will not result in a
product that will satisfy you. Fully coated lenses are quite economical and can
work well for you, depending on your needs. Multicoated or fully multicoated
lenses are both very good choices. Fully multicoated lenses give the best light
transmission and brightest images, and are therefore the most desirable.
Prisms
A binocular's prisms serve to invert the image and come in one of two basic
designs: Roof or Porro prisms. By design, roof prisms are more lightweight and
compact, for portability. Porro prisms are designated either BK-7 or BAK-4. Both
are economical and highly effective designs. The finer glass in the BAK-4 design
is of high density and virtually eliminates internal light scattering, producing
sharp, well defined images.
Construction
A critical factor in the performance of any binocular is its construction. The
security of the barrel alignment and proper internal mounting and alignment of
the optics are crucial to producing a binocular that's mechanically reliable,
smooth functioning and long-lasting.
Collimation
The alignment of the optical elements of the binocular to the mechanical axis.
Good collimation prevents eyestrain, headaches, inferior and double images
while improving resolution. Unfortunately, proper collimation is almost impossible
to achieve in very low-priced binoculars that lack quality components and design.
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.
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