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How to Choose the Best Birding Binoculars

Optics workers will tell you they are often asked to recommend the best binocular for birders (bird watchers) To match the binocular to the birder it helps to first look at the needs of the birding enthusiast.

What sort of optical demands must we consider? Well for one thing the birder need to see details like the patterns and color of feathers, often in dim light such as under a tree canopy or in twilight. They need good magnification so that they can easily identify birds at a distance and sometimes they will want to observe birds at very short distances so they want their binoculars to work for close focus observing too, maybe even down to just a few meters.

They need true color viewing so they can see everything as it really is colored and not with any tint or false color. They also need a reasonable field of view so they can observe birds in flight easily and be able to pick birds out from the surrounding trees.

They want the binoculars to be light enough to carry and hang on a neck-strap. Their binoculars should be light enough to hold comfortably for viewing and easy enough on the eyes to be able to use for long periods. Birders usually want their binoculars to be compact enough to pack in a rucksack. For observing from hides they often want to use their binoculars on a tripod or mono-pod so a fitting for these adapters is advisable. If their Bird Watching is in the wilderness then rugged construction and some element of waterproofing and fog-proofing is also advisable.

When looking at binocular specifications we usually pay most attention to the two numbers that define the basic specifications. The first number gives us the magnification factor, so an 8x binocular magnifies an image (brings it closer) by 8 times. The higher the magnification the more difficult it becomes to use the binoculars effectively due to the natural hand-shake which makes it difficult to keep the bird in view and also the smaller the field of view will be. For birding use, an 8x binocular is the most commonly used though in some circumstances enthusiasts will use higher magnification.

The second number in the specs tells us the diameter of the Objective Lens. This is important for two reasons, firstly the larger the diameter the more light is captured by the binocular so the clearer and brighter the resulting image. Secondly, the larger diameter also gives a larger field of view. In the birding world, the most popular objectives are 40mm and 42mm. Getting much higher than this makes the binocular a little too heavy and large.

Other important considerations are the quality of the lenses and prisms and the optical coatings used on those elements. These coatings reduce loss of light through reflection from the binocular and its internal components and they help to preserve good clarity and true color throughput. As a rule of thumb look for Fully-Multi-Coated (FMC) coatings for bird watching use. The specification for Eye Relief refers to the distance between the eyepiece and the eye. Those who wear glasses will need a longer eye relief to allow for the extra distance caused by the glasses being between the binocular and their eye.

Roof and Porro Prism designs refer to the two body styles of binoculars. This difference comes about through the placement of the internal prisms within the binocular body. Roof Prism types are the more compact and modern looking. Their objective lenses are more or less in line with the eyepieces, while porro prism types are the traditional style with the lenses stepped out from the line of the eyepieces. More and more birding enthusiasts are now opting for the roof prism type particularly as their quality has caught up with the porro types in recent years.

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The Best Birding Binoculars & Where to Find Them

Field of view of binoculars?

Hi everybody,I have a really old question guys
does anybody know how to calculate binoculars' field of view?
I have been looking for the answer for a long time..
thnx

It's the field of view of the eyepiece divided by the power of the binoculars. When you look into the eyepiece, the angle of view depends on the binocs, but usually 30 to 60 degrees from top to bottom. For a do-it-yourselfer, look at a wall from a fixed distance, say 10 feet. Measure the width of your scene, say from the left side of a painting to the right side, then determine the angle ( 2 x arctan( (width/2)/distance )) and divide it by the power to get the true field of view.

Of course, you might not be able to focus at that distance, but you can use one eye to look through the eyepiece and the other eye to superimpose the field of view on the wall.

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