Canon ER-hE Eyecup

The asymmetrical shape really does block stray light perfectly when shooting in bright sun. It clicks into place securely and rotates smoothly, which makes switching between vertical and horizontal grip positions effortless.

I was skeptical about the rotating design at first, but it actually makes a huge difference when switching between horizontal and vertical shots. Blocks out glare perfectly even in bright sunlight.

The asymmetrical shape on this eyecup really does block out side light, making it easier to track fast-moving subjects through the viewfinder. It rotates smoothly too, so I can comfortably shoot one-handed or with my left eye without adjusting the camera.