Recently I have branched out from things I am familiar with. Playing with settings on my camera, trying to figure out how things work. In doing so I have found a lot of noise in my pictures. When I blow them up to touch them up, they're not as sharp as I would hope they would be on a larger scale. Now with this particular lens I do most of my photography. It's a 55-200mm lens that came with the camera (reminder, the camera was used.) When doing close ups, i.e. on flowers or things of that nature, I'm having a hard time finding focus. It takes a minute or two to get my lens focused in and then sometimes I can repeatedly hit the shutter button and nothing. No click, no picture. My camera refuses to take it. I have to take a step or two back and try again. Sometimes it works, sometimes it doesn't. Using this picture as an example. I was about four feet away and my camera still didn't want to take the picture. I hit the shutter button several times and nothing. Stepped back, and voila? Is it me? My camera? My settings? Do I need to replace this lens? Typically when these things happen which is it? I've read the manual several times and there are things I'm still not grasping. In this particular photo it was very BRIGHT outside, and I had to tone down my ISO. My camera kept trying to focus on other things ( I was in auto focus mode ) and finally managed to get on the same page and get a few pictures shot. Maybe my ISO was still to high? This is the raw image, unedited. As you can see the edges of the flower I was focused on are almost over focused and the area of focus is very bright still. Can I get some input?