These next images show someone how the angle stays the same but the area that you are actually observing increases. You can see the 5th image how the bottom of a building would disappear.
Even though the title is BS. No one sees further. You ONLY capture more light.
This is how they build telescopes, to capture light.
Large telescope are reflectors. The larger convex lens gets the more distortion. So they made this. It all works the same generally speaking. A telescope will only help so much. It depends on the light collecting ability that is determined by the diameter of the lens. Some of these aren't built yet... https://cdn.discordapp.com/attachments/379214321907007488/460954948222320640/512px-Comparison_optical_telescope_primary_mirrors.png
They are making the lens bigger not building 15 mile long telescopes.
