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A wireless security camera transmits video wirelessly from a transmitter (built into the camera) to a receiver (a DVR or monitor). However, wireless security cameras still need wires for power. Batteries cannot provide the power needed to sustain a camera and transmitter for more than a day or two.

The two types of cables used for the installation of Security Cameras and Digital Video Recorders (DVRs) are Plug and Play Cables (PnP) and RG59 Coax Siamese cable. Each type of Camera Cable has positives and negatives about them which is disussed below.

Some digital cameras can adjust for lens focal problems. Sometimes the focus was sharp enough but other times, especially at f/2.8 (limited depth of field) the shots were soft. This was a film camera and no local calibration was possible. 

UV filters are practically useless (image-wise) on DSLRs since digital sensors are not nearly as sensitive to UV light as film. So don't spend $150 on a "premium UV filter" if you're shooting digital. Just grab a $20 one off amazon and use it as a lens protector. 

Generally photographers put UV filters on DSLRs for the larger purpose of protecting their lenses. Lenses can cost hundreds or thousands of dollars, whereas UV filters are generally less than $40, and sometimes less than $10. 

The lens manufacturer starts with a mixing of chemicals and fusing them in high temperature, making the glass. The glass is fused, coooled, cutted and polished, and you have a lens.