Keeps correct subject position even with 360 degrees rotation * Diopter adjustment to accommodate for individual eyesight. Rubber eyecup for comfortable viewing * Supports Multiple Brands of DSLR SLR Cameras from Canon, Nikon, Pentax, & Olympus * 1-3.25X optical magnification, can observe the details well. * Well sealed hood blocks out the light while magnifying the frame for accurate color and focusing.