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I've been trying to keep up with all the new photography concepts in this thread, but "Faster Glass" is throwing me off? How can glass lenses be "faster?" All

• shawnz 7y ago
  I think that's correct (because it lets more light reach the sensor due to the bigger aperture, so less exposure is necessary)
• KineticLensman 7y ago
  Faster is taken to mean that a lens has a larger maximum aperture, meaning more light gets in, so you can use a faster shutter speed, and hence get less motion blurring. Non-intuitively, because depth of field gets smaller as the aperture increases, faster lenses can also offer better separation of the subject from foreground / background features