HAWK 150-450mm T2.8. High Speed Telephoto Zoom Lens – you can quickly change it from a 150-450mm T2.8 to a 100-300mm T2.2. This is the industry standard at the 450mm end of zoom range. It´s also the fastest 100-300mm available. How does this lens give you two sets of zoom ranges? – it comes with a separate optical reducer. When you insert that, all the focal length are reduced 0.7 times.