The first deciding point when choosing the best binoculars for your survival kit is to understand that it’s a myth that a binocular can be efficient in everything. The same pair which you use for star gazing can never ever be of utility if you use them at a concert. While most of them are made with particular purposes in mind for general survival kits I suggest you get some general purpose ones and, if you have a particular situation maybe some specialist ones e.g., for use at sea or low light etc.
In case you are wondering what those numbers on the casing mean, they denote magnification capacity and the diameter of the lenses.
Suppose the number appearing is 8x 40, you then know that it can magnify 8 times and it has a 40 mm lens diameter. The greater the magnification the poorer the image quality and the harder it will be to hold the binoculars steady enough to enjoy the view. In terms of utilitarian value and outdoor functionality the 8 to 10 times magnification is the most preferred choice of people. Pairs with 4 times magnification are perfect for concert viewing.
The diameter of the lens plays a critical role too as a larger girth attracts more light and increases the quality of the image as well as widens the span of vision. The field of view is denoted by angular dimensions or as feet measure from one side to the other as it shows at 1000 yards. As the field of view gets smaller, it becomes increasingly difficult to locate your target.
Those are the most basic factors, after these we start to get into a few more technical aspects such as the type of glass used and eye relief. This could be vital especially when you need your glasses during using any optical tool. This involves the gap between your eye and the eyepiece of the binocular. If you wear glasses while viewing you’ll need to allow for the extra distance caused by your specs, between the binoculars and your eyes.
The quality and the price depend on the coating used on lenses and prisms. While different coatings do different things, but their main job is to curtail the loss of light caused by reflection. The difference in price and quality of one brand and type to another largely varies due to the superiority of the coatings used.
Over and above these factors, you may also look into aspects like waterproofing and sturdiness of constriction for frequent use, etc. A binocular can offer many things but then the cost also goes up accordingly, so it is a wise decision to get one which is affordable and continue enjoying it.
