A wise man once said: if you are looking for mistakes use a mirror, not a telescope.
5 mirrors, 5 letters. And the eagle has two of them? His letters will give you the clue. The red lines tell you what order to put them in. Then you just need to 'translate' the letters into the Greek alphabet.
This gives you the following letters: I, S, M, R, E. If you 'translate' these into the Greek alphabet and add a little imagination you will get the final solution: LOUPE