Performs a similar function to the Porro prism, but can be fitted in a straight barrel for a streamlined appearance.
Cushions the binoculars against shocks and makes them easier to grip.
Will survive temporary submersion up to one metre underwater for 5 minutes. Not suitable for use underwater.
Can be used in rain or snow and rinsed in running water to remove mud and dirt.
Binoculars with an apparent field of view greater than 65º are generally accepted as having a wider field of view and offer a broader perspective.