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Lecture 15: Cameras & Lenses (45)

On a camera, exposure is determined by three primary named factors including aperture, shutter speed, and ISO. Aperture and shutter speed are most closely associated with exposure time on the slide, where as ISO seems to be most associated with gain.


Exposure time is super important for applications like astrophotography. Longer integration times per photo mean that you’re able to collect more light on the CCD’s pixels, allowing you to get brighter images. However, taking longer photos means you get more blurring from the movement of the Earth. To fix this, you can take multiple photos with short exposure times and add up (and normalize) their pixel brightnesses. Not only can you “see farther” into space, these normalized images have far less noise than the original image!

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