Buying a binocular involves "trade-offs". In order to get the brightest possible image in low light conditions you will need low magnification with a large "objective lens". But many of us don't want to sacrifice magnification. After all isn't this why we are buying a binocular? We want to see objects far away as though they were close! You may also want a "wide field of view" so you can see as much action as possible at a sporting event. So, you will find that you need to know how, when and where you are most likely to use your binocular. In the end you may decide to buy several different models to meet the needs of the different types of viewing situations you intend to enjoy.