Factor of magnification binoculars
For the observation of birds, binoculars with a magnification of 10 times or 8 are most suitable. (We’re not talking telescopes because that’s another story.) A higher magnification x 10 provides a very narrow field of view and an image that is more difficult to maintain stably. It is more complicated to follow birds in flight. A pair of binoculars with a magnification smaller than 8x does not show enough detail of the image.
The diameter of the objective is important because it determines, first, the amount of light output and determines experience when using binoculars (the higher the number is, the better) and, on the other hand, the weight and size of the binoculars. It is a compromise between image quality, weight and size.
The twin 42 mm diameter are very popular in ornithology. This size is considered a good compromise between image quality and size / weight.
Width of the field of vision
For the observation of a bird in the air, you need a large field of view, otherwise you lose the bird quickly view.
The field of view depends on the magnification but also the construction of binoculars. Pay attention to the following points.
For a pair of binoculars 8 x 42, a field of view of 130 meters to 1000 meters is good and a field of view of 140 meters is very very good. For a pair of binoculars 10 x 42, a field of view of approximately 115 meters to 1000 meters is a good value.
Color fidelity, sharpness and other optical properties
If you want to enjoy nature, good image quality is of course important. Color fidelity and sharpness are important optical properties for binoculars for bird watching.
We often speak of the ‘sharpness at the edges’ as a feature for recognizing quality binoculars. However, be careful. The sharpness at the edges must always be evaluated with respect to the width of the field of view. With a pair of binoculars with a narrow field of view, it is not difficult to obtain a high edge sharpness, and there are even manufacturers that adds an edge to their binoculars (which cuts a piece of the field of vision ) just to increase the sharpness at the edges.
a pair of binoculars with a wide field of view and good sharpness at the edges is a real challenge.
For a birdwatcher, it is very important that the binoculars can be developed quickly so you can watch a bird cleanly. Some with binoculars, you should turn the focusing mechanism several times in order to improve the image by moving from a short to a long distance, but with other twins, as our twins Eden Quality ED and HD 8×42 , one move is enough.
At first it may take some getting used to, but once you become accustomed to the rapid development, you will not want to change.