The Bushnell Prime 1300 6x23.5 Black LRF features an entirely glass optical system featuring fully multi-coated lenses, doubling the light transmission over previous Bushnell models. The Prime 1300 is designed for bow hunters. It uses Angle Range Compensation (ARC) to account for angled trajectories. Bushnell's EXO Barrier coatings on the external lenses help keep the lenses free from dirt and water. While using the Prime 1300, you can select either Brush measurement mode that ignores brush and twigs between you and the target, or Bullseye mode with can isolate small targets against a busy background. In scan mode, the Prime 1300 updates readings 4 times each second.