Surveillance cameras are for example used in surveillance networks for observing areas of public places, schools, universities, private households, prisons etc. Usually such a surveillance networks comprises a plurality of cameras and a surveillance control center, whereby the cameras are connected by public or private network with the surveillance control center, so that images, captured y the cameras can be transferred to the surveillance control center. A camera (1) comprising a motorized object lens adjusting module (3) for adjusting the object lens or parts thereof, an image processing module (4) for processing the images captured by the camera (1), an interface module (5) for providing Signal interfaces and an external housing enclosing the modules (3, 4, 5), is disclosed, with an internal assembly frame (8) for holding the said modules (3,4,5) as a unit (8) independently from the external housing.