This is the Nikon D200. I'm going to show you how to change the lens. It's important that you do this on a nice clean flat surface where there's absolutely no chance of you dropping anything. It's also important that when you actually make the transfer of the lens, you do it as quickly and as efficiently as possible to minimise the dust contamination getting into either of your lenses or into the body of the camera. This is absolutely essential to keep your camera in good condition. So to remove the lens, the lens release button is just to the side of the lens on the body of the camera here. If you press and hold that button, you can twist the lens until it's disconnected from the body. I'm actually going to leave that in position on the body of the camera until I'm ready with the new lens. So the new lens, I'm going to take the protective cap off the bottom and that's ready to go on. Some lenses will tell you the alignment by the presence of a dot on the lens that lines up with the dot on the camera body and that's the position that this lens should be put in. With other lenses, that may not be quite so apparent. There may be dots around to the ring of the lens. On this particular one, the Nikon 60mm lens. It's the presence of a black screw on the inner ring of the lens and it's this black screw that lines up with the white dot on the body of the camera. So with that lens ready to go on and this lens ready to come off, I'll make sure that I can see where the black screw is and where it lines up on the camera. Pop the lens off, fit the new one on. Make sure the protective cap is on my spare lens now and that's securely stored. With this lens in position, I'm going to twist it until it clicks. That's your lens ready to go.