Canon 10x42L IS WP Find the binoculars that fit your needs, Lead-free optics, Judging quality

Find the binoculars that fit your needs.

Waterproof and all weather

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 new Canon 10x42L IS WP offers Canon’s highest standard of waterproof performance—it can be completely submerged.

Lead-free optics

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.

The importance of objective lens diameter

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 10x42L 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 10x42L IS WP, 18x50 IS AW and 15x50 IS AW produce particularly bright, clear images.

The key to Field-of-View

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 10x42L 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˚.

Looking through a 10x42L IS WP binoculars at a subject 1,000 yards away

c. Field-of-view at	b. Apparent	a. Real field-of-view: 6.5˚
1,000 yards: 340.6 feet	angle-of-view: 65˚

Differences in brightness

Canon’s Super Spectra Multi Coating

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.

results. For daytime viewing, binoculars

with exit pupil sizes between 2.5 and

3mm are often sufficient.

When bright....

Viewer’s pupil diameter is 3.0mm.

When dark....

Pupil dilates as wide as 7.0mm.

Objective element diameter

This refers to the front lens element measured in mm. All things being equal,

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 or dusk, or deep shade viewing conditions.

Judging quality

When evaluating binoculars brands and models, here are few things to look for:

Alignment

100 yards away with the naked eye.

10 yards away with

the naked eye.

With a 10x magnification binocular, the hot air balloon 100 yards away will seem as if it were 10 yards away.

Wide field- of-view

Narrow field- of-view

Since many things contribute to the brightness of an image, be sure to consider the following factors as you compare binoculars:

Exit pupil diameter

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

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.

Twilight coefficient

One difficulty with using traditional

numerical ratings to determine a

binocular’s suitability for low-light

If the parallel tubes of the binocular are out of alignment due to a manufacturing defect or accident, you’ll see two similar but separate images. There is no way to repair this problem and it renders the binocular virtually useless.

Color

Focus the binocular on a white object. Check two things: first, that the white object appears a faithful white tone

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