Hello! i consider myself ok at taking pictures, but i've been having problems lately. for some reason, my camera refuses to take pictures of my models up close. to get nice "ok" pictures, i need to move 2 feet back and zoom in, which isn't always an option, and things are as sharp as i'd like. I know the camera can zoom in on that stuff, because when i hold the button down half way it focuses a split second before focusing on the wall behind it . I have a Canon Powershot A75. Would anyone be able to tell me how to change the settings so that it will take close in pictures?