The Swarovski SLC 8x56 Binoculars are an optimal optic for searching for wildlife when the animals are most active, during twilight, due to 93% light transmission. This is enhanced by their 56mm HD objective lenses, which have edge to edge sharpness and light response. The SLC 8x56 binoculars are perfectly balanced, so long viewing sessions don't wear out your arms, while their generous 23mm eye relief do the same for your eyes. Their field of view of 400' at 1000 yds adds to their searching capability. As with all SLCs, they are rubber armored, waterproof and nitrogen purged.