When
· Teens
· · 2016
· · · September
· · · · 17 (1 entry)

Focal Length and Angle · If you care about cameras you probably like learning about interesting new (and old) lenses. They’re described by two numbers: How wide they open (also: aperture, brightness, speed), and how long they are (also: focal length). That first number is generally comparable across lenses: Lower is better. The aperture unit, “F-stop”, is hardly intuitive, but whatever. Focal lengths are hard to compare, because how much the lens sees depends on how big the sensor behind it is, and there are lots of different sensor sizes ...
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