the elevation knob on the sight until the proper range appears in the BORS display. The BORS automatically determines the air density, as well as the cant or tilt in the rifle itself, and incorporates these environmental factors into its elevation calculations. The SAM (Shooter-supporting Attachment Module) measures and provides aiming and ballistic relevant data and displays this to the user in the ocular of the Zeiss 6–24×72 telescopic sight it is developed for. The SAM has different sensors integrated (temperature, air pressure, shooting angle) and calculates the actual ballistic compensation. All indications are displayed in the ocular. It memorizes up to 4 different ballistics and 4 different firing tables. So it is possible to use 1 SAM with four total different loads or weapons without an additional adjustment. CCD and LCD technology A totally different approach recently developed, which has been applied in the ELCAN DigitalHunter series and the ATN X-Sight series, essentially uses a video camera system to digitally capture, process and display the target image into the eyepiece, often with additional built-in rangefinder, ballistic calculator, signal filters, memory card and/or wireless access smart device interface to create a "smart scope" that can use augmented reality and store/share data. The ELCAN DigitalHunter, for instance, combines CCD and LCD technology with electronic ballistics compensation, automatic video capture, 4-field selectable reticles and customizable reticles. In 2008, a DigitalHunter Day/Night Riflescope that uses infrared captured by the CCD to enhance low-light capabilities became available. It is also possible to attach infrared light sources to use such sights in total darkness, though the image quality, and overall performance is often poor. Some jurisdictions however forbid or limit the use of night vision devices for civilian use. Mounting As very few firearms come with factory-built telescopic sights (the Steyr AUG, SAR 21 and H&K G36 being exceptions), mounting a separately acquired sight to a firearm requires additional accessories. A typical sight mounting system consists of two parts, the scope rings and the scope base. The mounting generally positions the telescopic sight axis without cant over the receiver and bore center axis, to make sighting in and the use of ballistic tracking at various ranges for the user as easy as possible. Scope rings Because the majority of telescopic sights do not come with a built-in design for direct attachment onto something, intermediate mounting accessories are needed. Because telescopic sights universally have a round