Exit Pupil is a feature of binoculars that relates to your age and the time of day that binoculars are to be used. One should first understand that the pupils of our eyes change with the conditions of the day and our physical age. During the bright daytime hours our pupil may be reduced to as small as 2.0 mm. However, they begin to expand as the day looses light and may expand to between 5.0 mm and 8.0 mm as darkness sets in.

The second number in the 8 x 40 pair is the size of the objective lens. The bigger the number, the heavier the best thermal scope. This is the main drawback to a large objective size. Everything else about the bigger numbers is an improvement. The bigger the number, the more light that comes through, and the easier the binoculars are to use at dawn and dusk. The bigger the number, the wider the field of view – this makes it easier to find where you want to look – too narrow a field of view then you only see a smaller area and it becomes more difficult to point your binoculars to the right spot.

Think about how you are going to be using your binoculars. If you are using them for sporting events or bird watching you probably will not need as much magnification as if you were going to use them for astronomy or to view distant objects like mountains or the Grand Canyon. You also need to think about the lighting conditions. If you will be using your binoculars during the day you will not need the same size lens as a hunter or an astronomer.

Two numbers that you will you have to pay attention to describe the magnification and the size of the objective lens, respectively. Binoculars are listed as 8×25 or 12×42. In the example of the 8×25 binoculars the 8 refers to how many times an object can be magnified. The 8 indicates that these binoculars can magnify an object up to 8 times. The 25 refers to the diameter of the objective lens, or the lens that is furthest from your eye. So, 8×25 binoculars have a lens diameter of 25mm.

Bird & Animal Watching Clubs: Binoculars will obviously go down well with such clubs. You can give them away to promote your business to the members or perhaps use the binoculars as a prize.

Bird & Animal Watching Clubs: Binoculars will obviously go down well with such clubs. You can give them away to promote your business to the members or perhaps use the binoculars as a prize.

A digital camera makes a great accessory as well. You can capture the images of the amazing fish you see in the water. For the best results get a digital camera that securely fastens to your fishing binoculars. You want to make sure it is going to hold up to the various elements as well including salt water.