The OV-140 OperaView from Carson Optical is a 4x10mm Ultra-Compact Binocular that is so portable you can bring it with you anywhere. It has a center focus knob for maximum focusing flexibility. These Binoculars feature BK-7 prisms and fully coated lenses. They are the perfect companion for sporting events, the theater, the opera and concerts.
Prism Type: BK-7.
Lens Coating: Fully Coated.
Eye Relief: 13mm.
Field of view: 525 ft. at 1,000 yards.
Dimensions: 3.5" x .5" x 2".