Atmospheric haze and heat waves can't always be eliminated, but using a haze or polarizing filter can help cut through the haze and increase color saturation and contrast. Also, use your lens hood, or shade the lens, to minimize the possibility of flare. Few techniques in photography require more expertise and skill than the successful use of a long tele or zoom lens. If you want to become more proficient, practice, practice, practice! Using a telephoto lens to get in close to the action or sneak up on a subject from a discreet distance is terrifically exciting, and can yield great pictures. But the high magnification of long tele and zoom lenses accentuates the effects of camera shake caused by your inability to hold the camera and lens absolutely still. The effects of wind, moving or shaking floors, residual vibration from camera mirrors flipping up just prior to exposure, atmospheric haze, and heat waves can also add problems.
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When handholding your camera and lens, start with a fast film, ISO 400 or higher. This will allow you to use higher shutter speeds (1/1000 sec and above) and minimize the effects of shake in a variety of lighting conditions. Use the proper stance: arms closely tucked into the body, elbows partially supported by the chest or abdomen, lens and camera balanced by the left hand and arm.
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- Practice supporting and focusing the camera with your left hand, aim the camera slightly above the subject, take a deep breath, let the view drop to the proper composition while exhaling, and gently press the shutter.
- For support, find a fence post, parked car, or folded jacket. Lean on it or rest your camera on top of it while shooting. If you have such a support, a 1/30 second exposure isn't an impossibility, even with a 500mm lens. You'll be using slower shutter speeds more often than you'd like. The minimum shutter speed rule of thumb for hand-holding a long tele or zoom lens is this: Slowest safe shutter speed = 1 over the lens focal length.