thanks to both of your for the replies, and I think I start to get the picture. I have no budget for a cctv system but would still like to see whats going on in an open area behind my house, day and night. I can get a camera with the following specs made by Pentaone at a good price and thought I'd play around with it for that purpouse, so if you guys say that a pinhole is less sensitive then the 0.05 lux is an overstatement, or what?:
Pin Hole Black and White camera, designed for covert CCTV installations.
Specifications:
Signal Format: CCIR
Horizontal resolution: 420TV Lines
Pick-up device: 1/3" Interline CCD
Viewing Angle: 90°
Scanning System: 625 lines interlaced
Synchronization: Internal
Video Output signal: Standard composite signal 1Vp-p composite video into 75ohms
Light sensitivity - 30 IRE: 0.05 Lux (Scene)
Auto-Iris: 1/50 - 1/100,000 sec Auto
Signal to Noise Ratio: 45 dB or more (AGC off)
Gamma: 0.45
AGC: On
Input Voltage: DC 12V
Power Consumption: 1.1W or less
Operating Temperature: -10°C to +55°C
Storage Temperature: -20°C to +70°C
Operating Humidity: Under 95% Non-condensing
Storage Humidity: Under 90% Non-condensing