The new user-friendly ZEISS Ballistic Calculator app helps hunters and shooters of all levels to master the long range shot. Just select your ZEISS riflescope, ammunition type and enter environmental variables. The app will provide you with the optimum power setting for your riflescope, so that distant yardages coincide with the ZEISS ballistic reticle subtensions. The convenient slide feature visualizes how change in magnification settings affects point of impact.