F-Stop vs. T-Stop: What's the Difference?

Photographer Matt Granger asks the question, “When is an aperture of 2 not really a 2?” The answer? When the f-number doesn’t match the t-number. But, what the heck is the t-number? And how is it different from the f-number? Below, Granger explains the difference between f-stops and t-stops and compares a few lenses: Photographic cameras […]

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