SkipD wrote in post #2194921
Matt - first of all, please drop the second "e" for the word lens
There's really no such thing as a "digitally optimized" lens. Basically, that's just marketing hype.
Any EF or EF-S series lens (or third-party equivalents) will work on the 20D and the 30D.
EF-S lenses exist because their design criteria are different from EF lenses that need to cover the full 35mm film frame area (24x36mm nominal). The EF-S lenses are designed to cover only the APS-C sensor area (nominally 15x22.5mm) and are allowed to project deeper into the mirror box because the APS-C cameras have smaller mirrors than film or "full-frame digital" SLR's use. With these differences in basic specs, the lens manufacturers can produce a less expensive line of wide-angle lenses for the APS-C cameras.
What you need to consider in purchasing lenses is the required focal length(s) and required maximum aperture for the work you intend to do with them. If you don't have experience using various lenses, it may be virtually impossible for you to make an intelligent choice up front.
What is your experience level? If you've been using a point-n-shoot camera up to now, check the user's manual and see what the "35mm equivalent" focal length range of the lens is. Then, divide that number by 1.6 (for Canon APS-C cameras) and you will have the equivalent focal length range for lenses to use on the 20D/30D that will provide the same range of field of view angle as the lens on the point-n-shoot.
Ask a lot more questions and with the help you can get here and elsewhere (reading books, for example) you will become much more able to intelligently make the necessary decisions.
Sorry about the whole "e" thing SkipD, lol. Anyway, to answer your questions, I have a G6 right now, as well as all of the accessory lenses you could purchase for it. For my age, which is 17 at the moment, i think my skill level is high up there, not as high a business pro, but i do hope to be one eventually. That's why I think that buying the 30D would advance my options and skill level more than i can now. The lenses i want to get are at least a 75 - 300, wideangle, macro, and all-around lens. Like i saw a starter kit on ebay, for $1565, and it has these lenses, except the macro is the telephoto. But, i really have no idea about good lenses. And i'm jobless at the moment, but i have enough to buy and have some rebound money. So i was thinking instead of buying the ebay kit, get the body and lens seperately, this is all fairly new to me, so i'm doing this all on my own here.