Canon Scoopic 16 (Original) Meter Question in 16mm Posted April 4, 2018 You should notice the viewfinder getting darker or brighter as you adjust the aperture. You won't see blades or anything like that but it will get darker or lighter. Sometimes I find myself opening it up all the way to focus then putting it back to where it should be although this can be dangerous if you forget to set it back. It could be some sort of disconnection between the aperture ring (that's not on the actual lens but on the smaller meter lens) and the aperture. You should see a difference as you manually move it. You can still shoot a test roll and make notes of the aperture as you shoot to see if it's really changing or not.