 However, the AF mechanism in the G-series does indeed use a twin-window system much like that of the older mechanical rangefinders — only in electronic form.The viewfinder covers the field of view for lenses of focal lengths between 28 and 90 mm through an optical zoom, and automatically compensates for parallax error and field when focusing closer.The in-body finder shows 90% of the captured frame at 0.59× magnification when the "normal" 45 mm lens is used.