Side by side comparisons of a huge number of Canon, Nikon, and party lenses. Want to see if the Canon L is sharper then the high end Sigma, line them up side by side on the ISO 12233 Resolution Chart Comparison (or other comparisons)
I guess I hadn't really thought about how to hold a camera. not quite as obvious as I thought! And it makes a big difference in how clear my pictures are. Great photography tips. Entire site is devoted to photography tutorials to improve your skills!