With an adjustable diopter that enlarges the lcd image by a factor of 3 the sevenoak sk vf02 viewfinder is designed for use with most slr cameras with 3 screens it features 3x focusable magnification an optical designed lens an anti fog protective cover an eyecup preventing light leakage and a 40mm diameter diopter it connects to your camera via a baseplate using a 14 screw