Hi, I posted a question [a href="http://www.thephotoforum.com/forum/photography-equipment-products-news-reviews/210585-canon-ef-70-300-usm-lens-maintenance.html"]previously about blurred pictures[/a] with some of the shots I was taking. I'm using a Canon 20D with a Canon 70-300 IS USM lens. I wondered if it was the lens causing the trouble or me, figuring it was most likely my inexperience. Most of the comments alluded to underexposure. I also learned about EXIF for seeing the stats for the photos. I got an EXIF viewer and looked at some pictures I took in the last week. I've linked to 2 pairs to compare. It seems that all of them are underexposed, with the worse ones being more underexposed. Here are the photos: This one is better than its paired photo. They were both taken in the same place at the same time, but this one is up in a tree and the other in on a lawn just below that tree. http://i303.photobucket.com/albums/nn125/trailwind/TPFCC/July094.jpg This is the one I wanted to compare that to: http://i303.photobucket.com/albums/nn125/trailwind/TPFCC/July109.jpg I was using autofocus for both and had the red lights in the viewfinder for focusing, but the Killdeer on the lawn still came out blurry. This is the next pair. The first one came out ok. http://i303.photobucket.com/albums/nn125/trailwind/TPFCC/AugustWork031.jpg But this one, the one I really wanted(!), didn't turn out as well. http://i303.photobucket.com/albums/nn125/trailwind/TPFCC/AugustWork049.jpg I don't know what's causing the underexposure. All of the photos were taken during the day outside, not in direct sunlight usually. Do I have to start learning how to use the manual settings and make sure the exposure is working correctly? Or is there something about autofocus that I'm missing?