Binocular Advantages

Binoculars Performance

Canon Advantage - Binocular Performance
Image Quality
Waterproof and All Weather Lead-free Optics Objective Lens Diameter
Field-of-View Differences in Brightness Anti-Fog Eyepiece AE-B1
Several models in the Canon binocular line are waterproof or water-resistant. Designed to be used outdoors and on the water, these models are built to withstand a broad range of conditions including rain, humidity and more. The Canon 10x42 L IS WP offers Canon’s highest standard of waterproof performance—it can be completely submerged.
18x50 IS WP 15x50 IS WP 10x42 L IS WP
Canon uses environmentally-friendly lead-free glass in its optical systems. This creates the high-quality performance you demand from your binocular while protecting the environment from unnecessary harm.
Binoculars are described by the power of their magnification (18x, 15x, 12x, etc.) combined with the diameter of their objective lenses (50mm, 42mm, 36mm, etc.). The greater the magnification power, the larger your viewing subject will appear in the objective lens as you look through the binoculars.

For instance, if you use the 10x42 L IS WP to track a subject 100 yards away, it appears to be the same size as a subject located just 10 yards away seen without binoculars. All things being equal, the larger the diameter of the objective lens, the more light it can admit for brighter, more detailed images. So binoculars like the 10x42 L IS WP, 18x50 IS AW and 15x50 IS AW produce particularly bright, clear images.
The field-of-view is the area you see when you look through the binocular. The higher the magnification power, the narrower the field-of-view. The apparent angle-of-view is the product of the magnification times the real field-of-view. So in the case of the 10x42 L IS WP, the 10x magnification with a 6.5" field-of-view appears to have a 65" range; qualifying it as a wide angle instrument. The greater the apparent angle-of-view, the easier it is for you to pinpoint and track your subject. The Canon binocular line offers models with apparent angles-of-view that range from 45" to 67".
The brightness of an image is associated with the amount of incidental light that is reflected by the lens. Uncoated lenses can reflect away as much as 8% of incoming light per lens element — resulting in a dim image. For this reason Canon employs Super Spectra Multi Coating to enhance brightness. Since many things contribute to the brightness of an image, so be sure to consider the following factors as you compare binoculars:
The size of the image that emerges at the binocular’s eyepiece impacts image brightness. In dimly lit settings, a large exit pupil, for example 4.2mm found on the 10x42L IS WP, delivers brighter results. For daytime viewing, binoculars with exit pupil sizes between 2.5 and 3mm are often sufficient.
This refers to the front lens element measured in mm. All things being equal, the larger the lens in front of the binocular, the more light it can take in and the brighter the viewing image will be. The 18x50 IS AW and 15x50 IS AW have the largest objective lenses in Canon’s binocular lineup.
One difficulty with using traditional numerical ratings to determine a binocular's suitability for low-light viewing is that higher magnification binoculars, even those with smaller exit pupil size or "relative brightness" ratings, can often reveal better detail in low light because of their higher magnification. Twilight Coefficient or Twilight Factor accounts for the magnifying power of a pair of binoculars, and can be a useful rating — especially if viewing at dawn, dusk or deep shade viewing conditions.
Designed specifically for the 18x50 IS AW and the 15x50 IS AW binocular, these eyepieces prevent condensation and fogging. Useful in warm, humid or cold weather.
18x50 IS AW 15x50 IS AW