I just got back from some botanical gardens doing some photography, and as I look back through my pictures, over half of them seems to be slightly out of focus, enough to the point where the image doesn't look good. Why is my camera doing this? What can I do to fix it? Canon T2i, with kit 18-135 IS lens. Same thing seems to happen with my Sigma 50mm Macro lens too.
Any help will be apprecited.
I didn't find the right solution from the Internet.