Know your camera

Before looking for a digital SLR lens, you should know your camera. Lenses are made for each different camera and are rarely interchangeable. A standard 50mm Canon Rebel Lens is not going to fit on a Nikon D10. I admit, I've rigged a couple of lenses to work in my day, but the results weren't spectacular. In a pinch, it may work, but lenses are very delicate and can be very expensive. You're better off getting it right the first time.