Because the lens is MF and cannot communicate with the camera body, you will need to set the exposure mode to M, you won't get the meter in the camera to work with this lens, so you will need to work that one out for yourself, set the camera to a certain shutter speed, which using the old rule of thumb, you need to set the camera match the shutter speed with the focal length of the lens to reduce the chance of shutter speed, so using it set to 1,000mm, set the shutter speed to 1,000th of a second, you may get away with less if using it on a tripod, and then adjust the aperture to obtain a correct exposure, but it's going to be a trial and error job to work it out as even using a handheld meter won't be able to work it as it's such a long focal length lens, set the camera to use the Live View LCD screen on the back of the camera, and see what effect you get while trying a few settings, but as your working with digital it's not going to cost you anything to play around with the settings.