A man wearing a striped shirt has a camera slung over his shoulder.
The photographer is well dressed and carries a camera.
A person with a camera slung over his shoulders might not be a photographer.
While the man has a camera, he is not necessarily a photographer. A striped shirt is not necessarily a nice shirt, so "well-dressed" can't be inferred from Sentence 1.
Just because a man is carrying a camera does not mean he is a professional photographer.