I have a tamaron 28-300 since the sensor is film sized do I need a new lens? I shoot bikes in action so I need something in this range.

Everything about a digital SLR seems to work more quickly and responsively.That’s important when you want to make a grab shot on the spur of the moment, or expect the camera to take an action photo right now when you press the shutter release at the peak moment. Most point-and-shoot digital cameras are downright sluggardly compared to dSLRs when it comes to performance. You can find improved speed in three key areas, which I explain in the following sections.
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Two main types of sensors are used in digital SLRs today: CCD (charge coupled device) and CMOS (complementary metal-oxide semiconductor) imagers. Although each type of sensor uses different technology to capture images, there’s no inherent quality difference between them. Some vendors, including Sony, Pentax/Samsung, and Nikon, make great dSLRs based on CCDtechnology. Read More…