There are two things that are important to keep in mind when shopping for lenses for an EOS digital camera, such as the EOS 30D, rather than an EOS film camera. First, EOS digitals are still not that cheap,...
In short: Camera shake is a major cause for blurred, unsharp images. This is especially true for long tele-lenses in low-light conditions. The only classical ways to solve this problem is to use a fast (and...