It covers the three classic portrait focal lengths of 50mm, 85mm, and 135mm. What does this mean? In the past, you might have to change several fixed-focus lenses to take portraits, from half-length to close-up. Now, a 50-150mm F2 GM can handle it all! Whether you are shooting a romantic couple photo or a solemn wedding scene, you no longer have to rush to change lenses. It is really a blessing for photographers!