The Digital SLR Professional is designed to attach to your camera using the existing eyepiece and slots around the display. It easily snaps on and off, and features an optically clear plastic to protect your camera's screen. The simple pop-up design allows for easy opening to block the glare. Buttons on the Professional shades are aligned with your camera to reduce the wear and tear on delicate parts and components. This model suits the Canon EOS 400D.