How Digital Cameras Work | How Things Work with Kamri Noel


KAMRI: Digital cameras. We use them every day. They’re in our
pockets, on our phones. But do we actually
know how they work? How does a digital
camera take this. And make it this? Oh, hey, where did,
are you my expert? TOM: Actually, I am. Tom O’Brien the photo
engineer for National
Geographic Magazine. KAMRI: So you’re like the
perfect person to explain how all these cameras work? TOM: Well, I don’t
know about perfect, but let’s take a
look at this camera. When you press
the shutter button, the shutter opens, allowing
the light to stream through the aperture of the camera’s
lens to the camera’s eye. KAMRI: So when I hit the shutter
button it’s like pulling back a curtain to let the light
come in and hit the eye? TOM: Yes, but only for
a small amount of time. The camera only needs
a little bit of light to capture a moment. KAMRI: But how does
it record the image? TOM: The camera’s eye
or sensor as we call it, perceives the light
as electrical signals. To demonstrate this,
let’s take a photo. KAMRI: All right, I got this. Selfie! Cute! TOM: Indeed. Now this is what
your camera first saw. KAMRI: Whoa! TOM: These are the electrical
inputs of the light. KAMRI: Oh, like
pixels in a video game? TOM: Yes. That’s your camera’s
electrical signal of the incoming light. After your camera
collects the signal, it encodes it all as data. KAMRI: Like computer data. TOM: Yes, this carries the
measurements of each pixel. Every pixel’s
color and brightness. KAMRI: So, the more pixels a
camera renders from light the more detail in the photo? TOM: Totally! We call
this detail resolution. However. When a subject moves too quickly
for the camera’s shutter, it can appear
blurry in the photo. KAMRI: Huh.
Let’s try this. TOM: Yeah, let’s! KAMRI: Okay.
Huh, definitely blurry. TOM: Maybe increase the
shutter speed this time. Ready? KAMRI: Yes.
Much better. Tom? Tom? Tom? Now that you know
how that works, catch up on all the other
episodes of How Things Work by clicking right here. And also make sure you
subscribe to Nat Geo Kids by clicking down here. See you next time, bye! Captioned by Cotter
Captioning Services.

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