Built-in optical image stabilization uses 2 AA batteries
Wide, extra-bright field of view
Lenses are multicoated for contrast, clarity, and color
fidelity
Shock- and water-resistant
Technical Details
Prism: Porro II
Focusing system: Center-focusing
Magnification: 18x
Objective lens: 50 millimeters
Focus range: 19.7 feet to infinity
Exit pupil: 2.8 millimeters
Relative brightness: 7.8
Eye relief: 15 millimeters (long eye-relief)
Real field of view: 3.7
Apparent field of view: 66.6 (wide)
Field of view (at 1000 yards): 194 feet
Water resistant: Yes
Exterior finish: Rubber coat
Power source: 2 AA batteries
Battery life: 2.5 hours
Width: 6 inches
Depth: 7.56 inches
Height: 3.19 inches
Weight: 41.7 ounces
Image Stabilization and
More
With any high magnification binoculars, most users will experience
frustrating image shake. Unless fixed to a tripod, image shake can
render high magnification binoculars useless. Canon's IS technology is
remarkably effective at eliminating this problem and is widely used by
the television industry with Canon's professional broadcast quality
video recording equipment. A special VAP (Vari-Angle Prism) corrective
IS system sits between the objective lens group and the porro prism on
each side of the binoculars. Within thousandths of a second of the
binoculars being moved from their optical axis by vibrations, a
detection system activates the IS mechanism. The VAP shape alters to
refract or 'bend' the light path by precisely the right amount, thus
fully compensating for the vibration. It is this essentially immediate
response that effectively suppresses image shake.
Super Spectra Coating
A number of optical factors affect the brightness of an image,
including the amount of incidental light that is reflected by the lens.
An uncoated lens will refelect away as much as 8% of the incidentail
light, significantly dimming the image. Canon's Super Spectra Coating
prevents that reflection.
What do the numbers mean?
15x50? 8x25? The two numbers used to describe any pair of binoculars
are their magnification — 8x, 12x, 15x and so on —
and the diameter of their objective lenses — 25mm, 36mm,
50mm, and so on. The larger the first number is, the larger the object
will appear to be in the objective lens. For instance, if you use a 10x
lens and look at an object that is 100 yards away, it appears to be the
same size as an object located just 10 yards away. The second number,
the size of the objective lens, is important because the larger the
objective lens, the more light it can admit for brighter, more detailed
images, and the better suited they will be for lowlight situations.
