Hi, I woke up this morning and noticed a pair of birds (finches I think) were working hard bringing twigs into this new bird house I set up on my patio just outside my window. I set up my tripod about three feet from subject and zoomed in to 135mm ready to shoot with my wireless remote. The thing is that I had to stay outside in front of the camera... ( couldnt canon put a sensor/reciever for remote shooting from behind camera ??? ) Anyways, I had an idea to angle a mirror infront of sensor so ide be able to fire a shot from behind while hanging out indoors. Any thoughts ? is there such a thing that can be attached to the camera or tripod for this purpose ?