Did a shoot this weekend, RC Drag races for Middle River Hobbies. I was a little worried on the focus speed with the tamron, however, it tracked and got these sub 2 second cars surprisingly well. Here are a few examples. NIKON D200    ---    190mm    f/3.5    1/2500s    ISO 200 NIKON D200    ---    190mm    f/4.0    1/2000s    ISO 200 NIKON D200    ---    200mm    f/4.0    1/2500s    ISO 200 NIKON D200    ---    130mm    f/4.0    1/500s    ISO 800 This last one, happened so fast, that i didnt get that great of a pic of it, but i think it did satisfactorily. Shot with a D200 and a Tamron 70-200 f/2.8 CC Welcome.