What are some considerations in placing the location of the eyehole?
For a 2-mirror system, it’s important to note that the closer to the apex where the two mirrors meet, the more accurate the reflected image. While earlier scopes had a round eyehole in the center of the scope end, many later scopes have incorporated a teardrop-shaped eyehole, which enables the viewer’s eye to get closer to the “sweet spot”, hence creating a more symmetric image.
