31 Mar '14, 1pm

Making Sense Of Aperture

As Adam Dachis said himself , when people are learning photography, they tend to have an understandably hard time with aperture. Lower numbers mean larger openings? Larger openings mean less is in focus? And why are different apertures called "f-numbers," anyway? Thankfully, there's a method behind this madness. Most people are taught that lower f-numbers mean more light, and higher f-numbers mean less light, and that's counterintuitive, but that's just the way it is. There's actually a fairly simple explanation for this, and the way photographers note aperture is a clue; for instance, f/2 . In much the same way a shutter speed of 250 means "1/250th of a second," so too are f-numbers ratios. In this case, the lens' focal length over the f-number will give you the actual size in millimeters of the aperture. In other words, f/2 is an equation ! f is the variable, and it is e...

Full article: http://hackerspace.lifehacker.com/making-sense-of-apertur...

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