We are getting ready to purchase a 3 megapixel IP camera. It comes with either a 4mm or 6mm lens. We will only be using the camera for still image snapshots on a specified interval. Basically, it's an IP camera that uploads a JPG image to the server every 5 minutes. The camera snapshot settings will be set to be a resolution of 1920x1080 (2 megapixel), so the camera will use some sort of mechanism to reduce it to this size. The 4mm and 6mm will both generate a 1920x1080 image, but from my understanding the 4mm will have a field-of-view of approximately 75 degrees, versus the 6mm which will be 50 degrees. So my question is... will the 1920x1080 image generated by the 6mm camera have more detail in it, than the 1920x1080 image generated by the 4mm camera, for the equivalent field of view from the 6mm camera? That is, will the 6mm camera image have more detail than the equivalent 50 degree section of the 4mm camera snapshot?
And, if we didn't set the camera to reduce down from 3MP to 2MP, would your answer still be the same?