I am still new to photography as I have only had my DSLR for about 2 years now but I have recently made a change in how I am using the lens hood on my 18-135mm lens. In the past I have used it when I was outside in the sun. When I was inside for birthdays, holidays and others pictures like that I would usually thow it in my bag so the lens wasn't so large. When I purchaced the camera the salesperson talked me into a clear filter for protection. I have now decided not to use the filter in order to increase sharpness and I will always use the lens hood to protect the front piece of glass. I can't comment on the quality of the pictures when using a lens hood but I like the protection from damage they offer.