Why doesn’t the MAXI glare cover have a special elastic to tighten over the lens?

Because not all lenses are created equal. With prompt-it® MAXI‘s glare cover, you can simply drape it over your camera (even put your head under the cover if you are using a small camera like a GoPro). If you want a tighter fit, use a clip such as a binder clip or a clothes peg and clip the cover tightly around your camera lens. It’s easy, fast to set up and works with EVERY camera, regardless of your lens.