You (Probably) Don’t Need an f/1.2 Lens: The Law of Diminishing Returns

Photography is an art form of trade-offs. When the shutter speed goes up, the aperture must come down. Higher ISO raises the exposure but hurts the image quality. A brighter maximum aperture means more cost and more weight. Everything is based on a give-and-take relationship, and balancing these factors is key to success.

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