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Coated Lense Binoculars

Take a look at coated lense binoculars..... What are the different types of coating?... Which are the best?...

Why do binoculars' lenses need to be coated?

Basically, to stop as much light as possible from being reflected and lost, and to improve image contrast by elimination of stray light.

Binoculars can have as many as 16 air-to-glass surfaces, and each of these can lose light.

So, your binocular's interfaces need to have optical coatings applied in order to reduce reflection.

The quality of your binocular's coatings can make a tremendous difference to image quality.

For example, a pair of 8x40 binoculars with excellent optical coating canrender a brighter image than an 8x50 pair that has poor or no optical coating.

Most modern binoculars possess anti-reflection coatings of one sort or another on their air-to-glass surfaces.

And, it's because of these coatings that, when you look at the front lens, it appears to have blue, green or red reflections.

In fact, the coating has no color at all, but the light waves enter thecoated lens with different lengths which determine the colors you see on the lens' surface.

Binocular manufacturers use a variety of coatings, which come in different grades.

Coated Lense Binoculars - Different Grades

When studying information about a pair of binoculars, you'll find the manufacturer describes the coating in a number of ways:

• coated
• fully-coated
• multi-coated
• fully multi-coated

What do they mean? ...

Coated means a single layer of anti-reflection coating on one or some lens surfaces.

Fully-coated means all air-to-glass surfaces have a single layer of coating.

Multi-coated means that one or some surfaces (usually the first and last) have multiple layers of anti-reflection coating.

Fully multi-coated means all air-to-glass surfaces have multiple layers of anti-reflection coatings.

Which Coating Should You Choose?......

Binoculars which are fully-coated are obviously better than just plain "coated" binoculars.

And multiple layers of anti-reflection coatings are more effective than a single layer of coating.

So, ideally, you'll want your binoculars to be fully multi-coated,especially if you plan to use them for, say, astronomy, where elimination of stray light would be an important factor.

Once again, you'll need to decide what you'll be using your binoculars for, and how much you can afford to pay.

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