To what extent this is so might depend on the size of your biceps or your resistance to headaches caused by hanging heavy objects from your neck. All other things being equal, lighter is better. Size and shape. Some binoculars are twice as long as some others while width can also vary by a factor of two. Some people will prefer larger binoculars while some will prefer smaller.
Many people find that the roof prism pairs are easier to hold for long periods of time.
This is especially important if one is carrying other gear, such as a camera. A big disadvantage of the most compact models is that many people have a very difficult time aiming them accurately enough to find the butterfly. Imagine trying to aim a pistol vs aiming a rifle. Eyeglass user friendly. If you will need to wear eyeglasses while looking through your binoculars, you should make sure that the pair in which you are interested can be used this way.