What is aperture and how does it affect a photograph

aperture is the opening inside the camera lens. The mechanical part is a diaphragm made of several blades which can be adjusted to change the size of the opening. it can effect a photograph because it controls how much light you let into the camera sensor. if you let in too much the picture will be to bright and if you let in to little the picture will be to dark

Explanation:

photography had emerged as an elite art pursued by a few creative individuals for a few wealthy patrons. but now, said bauldelaire, it was succumbing to "the great industrial madness of our times." it was becoming a mass production industry that catered to middle-class tastes, including a taste for gadgetry. the stereoscope, the first 3d imaging system, had turned looking at photographs into parlor entertainment. a "thousand hungry eyes were bending over the peepholes of the stereoscope as though they were the attic-windows of the infinite.

modernism is a 20th century movement