Roof prism binoculars
prices on 303 modelsRoof
— a distinctive feature of devices with Roof prisms is the location of the lens and the eyepiece on the same axis. Due to this, such models are more compact than devices with Porro prisms, but due to the complexity of the design, their price is usually higher, and the stereo effect (in binoculars) is relatively weak due to the small distance between the lenses.