Should I choose binoculars with Porro prisms or roof prisms?
Porro prism binoculars are designed using prisms in a Z-shape. The prisms themselves encompass a wider area, so the objective lenses are spaced further apart. This type is usually more bulky but often perform better at a lower price. They yield a better three dimensional and wider field of view, but may be more likely to be knocked out of collimation when bumped or dropped. Roof prism binoculars are more streamlined, compact, and lightweight, but must have anti-reflective coatings to work effectively. They are more durable, less likely to fog up or allow dust into inner mechanisms, and their internal focus system gives them better integrity as well. You may wish to choose Porro prisms when you want to start with a lower priced model that still performs well. If you are hunting or using binoculars on a boat or in the military, the extra investment in tougher, lighter roof prism binoculars is worth it. Ultimately either type can give clear images and offer good magnification and light co
