I do not know myself too binoculars or telescope, I bought it in a haphazard, it based on other reviews. I am satisfied, it is larger and heavier than what I thought; I regret that we can not put it around the neck (nothing to put a cord) Both caches are not related to the object, be careful not to lose them. Otherwise, a magnification of 20, that's a lot for amateur use; we must ask the telescope to have a stable image;