Here is another learning series article and video. This time I go over the camera lens aperture. Check out the video on YouTube: The camera lens aperture is the variable opening inside the lens that lets more or less light into the camera. A small aperture has a larger number. See a full technical description of aperture on Wikipedia: http://en.wikipedia.org/wiki/Aperture Also important is the f-number that explains what the aperture number means: http://en.wikipedia.org/wiki/F-number f-number = focal length / diameter of the entrance pupil So if we want to know the entrance pupil size of an 100mm f4 lens we calculate it like this: Diameter = 100 / 4 Giving us a 25mm front lens element. An 85mm f1.4 lens results in a 60.7mm front lens element (85 / 1.4 = 60.7143). Aperture size vs. depth of field. The most important statement I didn’t cover in the video is “the aperture determines how collimated the admitted rays are,” so a small aperture has very collimated rays of light getting throu...
VIDEO | EXPLORATION | PHOTO