Knowing how to choose the best binoculars for bird watching comes down partly to a set of numbers. These numbers describe the optical qualities of the binoculars and you’ll find that the best binoculars for bird watching are not the same as the best binoculars for astronomy or boating or shooting. Let’s look at the numbers and what to look for in birding binoculars.
I remember many years ago when my father had the latest binoculars. They were the best you could buy at the time. Those things were huge and weighed a ton. There was no way you could go out bird watching with those things because birds would see you coming a mile away!
This maximum expansion depends primarily on our physical age. As a younger person our pupil may open to a maximum of 7.0 mm to 8.0 mm during the evening hours. But as we age the opening may be only 5.0 mm.
A third problem with high magnification is that the higher the magnification, the lower the amount of light that comes through the glasses. This is not such a problem during the brighter parts of the day, but towards dusk or first thing in the morning it can make quite a difference.
The highest magnification you’ll want or probably need is 10 to 12. Any more than that and you’ll have a real problem keeping the image you are viewing still. If you feel you want more magnification, think about getting a pair of stabilized birding best thermal scope or use a tripod.
Medium sized binoculars in the 10X42mm range are a good compromise of size and optic quality and are what most people buy today that use binoculars on a daily basis. A lot of quality can be packed into binoculars of this size. This size of binocular is also a perfect fit for the average sized hands. If you want to make sure you get the best binoculars for the money, be sure to keep them in the 10X42mm size.
Seeing the Heavenly Delights looking up at the night sky, watching the endless dance of the galaxy and seeing objects light years away from us is an exciting and humbling activity. To experience it to the fullest, purchase a stellar pair of astronomical binoculars.