These do not work at close range. The idea that they are constant focus only works when the object is at least 1000 meters/yards or more, and the farther, the better. In other words, half a mile away. There are often birds that are closer, so I use these when I see an unusual boat in the channel a mile away rather than a bird 300 meters away.
Pros: mid size binoculars with good lenses
Cons: not negligible weight
This review was written in the old system and had content requirements that are different than reviews written today.