For nature and bird watching we recommend binoculars with at least a 30-50 mm front lens diameter. The magnification should be between 7 and 12 times. Any more than this makes no sense without a tripod. At lower magnification levels, you cannot see the plumage details that may be important for identification.
The use of special types of glass or lens structures reduces colour fringing and also makes it easier to recognize the object being observed. For detailed observing over longer distances, we recommend the additional use of a spotting scope.
Here you can find out which criteria we use to evaluate binoculars for nature or bird watching ...
Binoculars that have too low or too high magnification levels, or whose exit pupil is less than 2.5 mm, or which cannot focus at a distance of 10 m, are "not recommended" by us for bird watching.
Of course, these binoculars can also be used to observe birds at the garden bird table, but for serious ornithology it is not advisable to use pocket binoculars or binoculars with single ocular focusing.