If you're searching for an additional Canon camera lens to supplement your EOS 300-D or EOS 10-D SLR camera, you have a truly staggering number of choices. Ideally, you should shop for a lens that fits your purpose. For instance, if you're doing a lot of touch work, you probably want something like the 1/1.8 inch attachment. That being said, you don't need to spend thousands of dollars on advanced EF IS USM technology to get a pretty picture.

In terms of recommendations, go with the 18 by 55 mm attachment for relatively wide-angle shots. For telescopic shots, above 75 mm, you can get a 75 by 300 mm lens. In between these two extremes, you should be able to finagle a good picture with the standard lens.

If image stabilization is important to you, make sure you get an IS lens. Of course, you don't need image stabilization to get great optical shots. If you're simply taking photos of people in front of non-moving backgrounds, IS technology will be superfluous. Unless you're a real shutterbug or technophile, there's no reason to spend hundreds of extra dollars to get small improvements for minor shots.

For people who really want to optimize the power of their Canon SLRs, you can go high-end and get something like the 70 by 200 mm / 4L. You can use this lens to supplement the units described above, as well. For more in depth help, consider consumer reviews of the various Canon EOS lenses to determine the accoutrements you need to shoot for your purposes. You can also call the Canon customer service department for more insight.