The job of a telescope is to gather light and bring that light to the eyepiece or camera. The larger the telescope's aperture, the lighter the telescope can gather making the image brighter, sharper, and able to produce more detail.
Longer Focal Lengths
Greater magnifications and image sizes are possible with both the eye and camera.
Why do I need a Telescope Lens?
If you sit far behind from the stage, you probably need a telescope lens to help you take good pictures on your idol.
Snap Awesome Night-Sky Objects
Like the Moon, Planets or UFOs (If you find one).
Take pictures on Birds or Animals that far away from you.