I recently saw a Red Kite reflection clearly in a second storey window in front of me, but on turning round could not see the bird as it was too low for a direct line of sight. Was talking to a colleague at the time so couldn't change position. Got me thinking if that reflection was any different to using angled scopes or bins with prisms...
...decided the line of sight meant it was different.
Going off at a tangent, would a marsupial enthusiast watching a live trailcam in Tasmania tick the first appearance of a Thylacine on-screen, or would the enthusiast be so scrupulous that he would suppress the news until he's actually tracked one down? On that note of enquiry, Happy New Year!