I've got a Nikon 5700 that takes marvelous pictures. Sometime back I bought a 3x zoom lens, that gives the camera an overall optical zoom of 24x. I started working with the zoom lens yesterday and am not overly impressed. I notice a blue tinge around the edge of the pictures. Why is this and what can be done to eliminate? Any particular settings to use on the camera. This is showing up with plenty of ambient light (no sunshine) and camera set for 100 ISO and f/4.5. Also using a tripod and remote shutter release. Help is appreciated.