Recall the story of the enthusiast and the entry-level dSLR photographers trading cameras. While I admonished against the danger of buying too much of a dSLR, I glossed the obvious problem: the entry-level photographers had a problem shooting the professional dSLR. How do you get there from here?
The answer is simple: learning.
Inside every dSLR is a complex computer and that computer makes decisions for you. This is true in both the entry and pro dSLRs: the difference is the entry-level cameras are configured to make more decisions for you. The trick is to realize that the entry-level cameras give you access to the pro-level settings, but you have to be willing to leave the safety of automation in guides, scenes, and McDonald’s-style graphical menus.
I’m not a snob. There is nothing wrong with those features and the computer makes some pretty smart decisions. It’s just unless you are bumping your head against the decisions it makes, you’re limiting yourself in the sort of photography you can do.
Even if we restrict ourselves to discussion of the same composition in the same camera, we are still left with setting shutter speed, aperture, and ISO. These three have a complementary relationship and are associated with different tradeoffs. Scene modes in your camera make the decision for you, but unless you know what that decision is and when it is wrong, you can’t really grow as a photographer.