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Some things to keep in mind choosing bird watching binoculars
Objective lens diameter: This is the front of the birding binoculars where the light enters the optics. 30 to 50 mm is the norm for a good optic lens. Compact pocket binocular optics usually come in sizes below 30mm. The larger the optic lens, the heavier the binocular.
Magnification: The usual choice for most birdwatchers is 7, 8 or 10x magnification in overall use. You don't want to have too much power because it will give you a smaller field of view, as well as less light entry and poor image quality. The binoculars will also be heavier and harder to manage and thwarting shaking will be more of a challenge.
Exit pupil: This is the diameter of light you can see in the eyepiece. 4mm exit pupil size is recommended.
Focus adjustment: The speed that you can refocus your image is very important. The best bird watching binoculars will allow you to refocus quickly from bird to bird.
Eye relief: Birdwatching with glasses can prove a real challenge unless you have eye relief that allows you to hold the binoculars away from your face and still get a full field of view image.
Prism Design: Another important aspect to consider:
Porro prism: In this case, the optical is Z-shaped and will give you a wider, more bulky and heavy set of binoculars that are not as well sealed as the O-rings are on the outside which allows in dirt and moisture. They are, however, less expensive although not as durable.
Roof prism: With a roof prism, you can look towards a more slim and lighter weight design. While these binoculars are more expensive, they are easier to waterproof or to make water resistant. Considered more durable than Porro optic binoculars, they can withstand a lot more abuse.
Lens coatings: Lens coatings let more light through which results in a high quality image with the best coating being a fully multicoated lens. A water repellent coating will also enhance your birding binoculars, which will help with light rain and fog conditions.
Lens coating abbreviations are listed below:
- Coated (C) means there is a one-layer coating on one lens surface.
- Fully coated (FC) is a one layer coating on all air to glass surfaces.
- Multicoated (MC) has several coated layers on at least one-lens surface.
- Fully multicoated (FMC) has several coated layers on all air to glass surfaces.
Birding binoculars is one of the essential pieces of equipment for successful bird watching because they will not only bring your images to life, but allow you to catch a load of sightings that would otherwise be restricted with the naked eye.
source: Compact Porro Binoculars，Monocular Telescope
Read more: http://www.nbbinoculars.com/blog/
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