First I'll say that I suspect the answer is that I need better glass. But, here are the things I've done to try and take really crisp, sharp photos:
1. Shoot at f-stops higher than 11 and as high as 22
2. Use a tripod
3. Clean the lens and make sure it stays clean
4. Make sure the subject is well lit if it's a still image (that could mean flash)
5. Use the lowest ISO I can
What I noticed the other day when shooting some video with the T2i and Magic Lantern (ML), is that when I use MLs "magic zoom" feature to zoom in on a subject for checking focus, is that I can't get a sharp focus no matter what I do. The sharpest point in the image is still fuzzy. Now this is with the kit lens 18-55mm zoom. I haven't compared the fixed 14mm I have.
Considering that I couldn't afford to buy lenses much over $400 before, and now that's out of the question for a while until I recover from the recent auto purchase, is there anything else I should try in order to get sharp images? Sure I could load the image into an editor and use filters to get it looking sharper. But I want true sharpness at the source. Tell me that it doesn't cost thousands of dollars to do that...