Here is an image gallery that shows the high definition video surveillance quality of the Viewtron DVR viewer app for iPad. At CCTV Camera Pros, we have a Viewtron VT-HD404 DVR connected to 4 HD-SDI CCTV cameras and 4 traditional CCTV cameras.
HD Security Camera Systems
Update! CCTV Camera Pros now recommends these HD security camera systems over HD-SDI systems. They use 1080p AHD cameras and HD-TVI cameras which are more affordable and can be run longer distances using RG59 Siamese coax cable. These systems have excellent mobile apps for iPhone and Android, as well as remote viewing software for Mac and Windows.
If you are not familiar with HD-SDI cameras, they use the same RG59 or RG6 coaxial cable as traditional CCTV cameras but they are able to support full 1080p resolution. They also require an HD-SDI compatible DVR to work. Some Viewtron DVR models are hybrid which means they work with both HD-SDI and traditional CCTV cameras. If you would like to learn more, there is an article here that explains further and explains HD-SDI vs. CCTV resolution.
In the above views, channels 1-4 are HD-SDI cameras and 5-8 are regular CCTV (this can be seen in the 8 camera view image). In addition to iPad, the Viewtron iOS app also works great on iPhone and iPod Touch. There is also a Viewtron DVR viewer app for Android that works on both phone and tablet format Android devices.