Anybody know what this lever does?
I thought that the EOS system is fully Electro-Optical, but obviously this lever must be useful for something.
I have noticed that if you push the lever upwards and simultaneously press the shutter release that the mirror will flip up while the shutter remains closed. Holding the lever in the upwards position and pressing the shutter release once more makes the mirror go down (but the shutter still does not fire).
Could it be that this feature is there for technicians wanting to get to the front side of the shutter? Or is there a more obvious, picture-taking-related explanation? I've searched the web but nothing's shown up to explain.
Thanks for any help,