try to find out right camera

‘iphone 4 versus canon eos 7D
http://www.youtube.com/watch?v=H7bStLePvKo


Logitech HD PRO
http://www.logitech.com/tr-tr/webcam-communications/webcams/devices/6816


Microsoft Lifecam HD-5000
http://www.microsoft.com/turkiye/donanim/digitalcommunication/ProductDetails.aspx?pid=019