Fully Multi Coated optics are standard features of the B&S Sahara range as are BAK-4 prisms. This ensures that as much light as possible is transmitted through the optics which results in a super bright contrast rich images for the user even in low light conditions where less expensive optics and coatings result in a dramatic loss of performance. For the comfort of the user the binoculars are supplied with twist up rubber eyecups which make them equally practical for people to use with or without spectacles. Rapid focus - gets you on the action fast The smooth focus mechanism takes the user from close focus to infinity in around two turns of the focus control knob, and the control can be operated with just one finger, which ensures that you can follow the action however fast it is happening.