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Message: <blockquote data-quote="aroy" data-source="post: 306287" data-attributes="member: 16090">Some lenses are designed for very low light photography. The wide aperture helps, but the main design criteria is to reduce "comma". Many low light lenses including the "Noct" series from Nikon and Leica have excellent "comma" rendering - the points of light remain points and not flare up into ugly comma like shape. That said, the sharpness and micro contrast may or may not be at par with slower lenses at F2 or above. That is why you use one lense for very low light situation and another in day light.The Nikon 50mm F1.2 is a day light lense and not a night lense (even though it is F1.2), as it has "comma" problems with light points, but it shines in day light at F1.2, and is one of the sharpest Nikons at F2 onwards.</blockquote>