See my copyright notice for fair use practices. Department stores and camera shops which do not know anything about telescopes, loudly proclaim their telescope's magnifying power.
Magnification is the least important power of a telescope.
Amateur and professional astronomers know that the light-gathering power and resolving power are the most important. These two abilities depend critically on the objective, so they make sure the optics of the objective are excellent. The ability of a telescope to collect a lot more light than the human eye, its light-gathering power , is probably its most important feature. Just as a bigger bucket catches more rain water, a bigger objective collects more light in a given time interval. This makes faint images brighter.