Whoever designed this lens hood doesn't know, or completely ignored basics about photography. Once you attach this hood on the lens, you CANNOT put a lens cap. That is SHOCKING to say the least. Anyone that is serious about photography knows that you always cover the lens when not in the process of shooting. The other design flaw is that there are no threads to attach another filter after attaching this hood to the lens or filter. So if you decide that it would be good to add a filter for a particular picture, you have to now unscrew the hood, attach the filter, then re-attach the hood. And oh, by the way, in your next picture, if you don't want the filter anymore, you get to repeat the process - unscrew the hood, unscrew the filter, re-attach the hood. That can be so much fun !!!