An improved overhead projector which allows for automated feeding of transparencies from input and output trays (38, 44) positioned within a body of the projector. The feed mechanism (32) is reversible to allow previously viewed transparencies to be repositioned over a light source on a table and seen on a screen. The trays (38, 44) include retractable mechanisms allowing them to be switched from receiving or delivering transparencies into a feed path. An optical projection head (28) includes an adjustable mechanism to automatically orient an image for transparencies in landscape or portrait views. The adjustable mechanism includes a first mirror which is adjustable to reflect light directly to the screen or to allow the image to be reflected by second and third mirrors before reflecting off the first mirror towards the screen.
