BSA Optics Optics 10-30X60 Zoom Binoculars -
Porro-prism binoculars with BK-7 prism glass, fully coated optics and a 60mm, objective lens diameter for increased light transmission. 10-30X zoom-power magnification with a convenient center focusing system makes it possible to find your subject at lower magnifications and then zoom in to view at higher magnifications. Fold-down lens cups with aluminum body can take the abuse in the field. Tripod adaptable.