The AF 100-300mm f/4.5-5.6(D) Apo is an easy to carry, easy to handle lightweight and compact 3X telephoto zoom. It offers high-quality images for telephoto shooting.The AF 100-300 mm f/4.5-5.6(D) Apo provides excellent operation for auto and manual focusing. During autofocusing, photographers can hold the camera in good balance and concentrate on framing, thanks to Minolta's Auto Clutch Mechanism, which does not rotate the focusing ring during AF drive. There is no need to operate any switch to activate the mechanism. The focus-hold button allows for stopping AF drive and releasing the shutter at the desired position. The button can also be customized to provide different functions such as continuous autofocus or central sensor selection, when the lens is attached to a camera body with Custom Functions. In manual focusing, the wide ring is easy to control, and rotates smoothly. This lens inherits the optical system of the renowned AF 100-300mm f/4.5-5.6 Apo, which provides high image quality. The two low-dispersion AD (anomalous dispersion) glass elements correct the chromatic aberrations that plague telephoto lenses. As a result, the lens provides fine images with excellent contrast and sharpness.Furthermore, AF 100-300 mm f/4.5-5.6(D) Apo supports the Dynax 7's ADI (Advanced Distance Integration) flash metering by providing precise distance information from the built-in distance encoder. Highly accurate flash-metering performance can be obtained.