What a genius idea this is. This DSLR lens hood is called the HoodCap Flower, and for good reason. You might say it blooms open into a usable lens hood and closes into a lens cap right there on your lens. If you're like me, I've long forgot about using a lens cap in my daily use just because of how inconvenient it has become for me. I do however, always have my lens hood on. Something like the HoodCap Flower combines the best of both worlds into a single lens attachment you can simply rotate to transform it into a lens hood or a lens cap. Sadly, this isn't yet a real product, just a concept for the time being. I seriously want one now!