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- Keep in mind what we're trying to do is balance each side
of the exposure, aperture, shutter speed, ISO,
in order to get a well balanced exposure.
So let's think about the balancing
of the triangle in shutter speed and aperture terms.
And let's make this about more light versus less light.
So you can't just have a very slow shutter speed
meaning we're letting a lot, a lot of light in,
and then have a really big aperture opening
because we're flooding the camera with light.
We have to balance those two.
At the same, at the same token on the other side,
we can't have a very fast shutter speed
meaning we're not letting a lot of light in
and then a very tiny aperture opening where
we're not letting any light in either.
So how do we balance those things?
Well, if I want to shoot say a portrait
and have that beautiful blur
and I shoot with a very wide opening at say 2.8.
Now I've got a big opening.
I'm letting a lot of light in right?
Now how do I balance that against the shutter?
Well I make it faster, right?
I cut off some of that,
the amount of time that the light is hitting
or passing through that opening
so that I balance out the exposure.
Opposite way.
I'm shooting a very, very tight aperture opening.
I'm trying to get everything in focus.
So I'm not letting a lot of light in through the opening.
So I need to let more time
for light to pass through that opening
by shooting with a slower shutter speed.
Now, the way that ISO will interact with these
is sometimes you're going to be in a low light situation,
for instance where you have to shoot
with a very wide aperture and a,
and a somewhat slow shutter speed.
And that still might not give you what you need
in order to capture the image with enough light.
So you might have to tweak that ISO up
in order to let more light in the camera.
The goal is for all three things to be in balance.
Everything's got to be imbalanced and in harmony
in order to get the great and perfect exposure.
So how do you know if you're getting the right exposure?
What you want to do is you're going to pick up your camera,
turn it on,
and you're going to pick something to take a picture of.
You're going to look through the viewfinder,
find that thing that you want to take a picture of
and then half press the shutter button.
What happens is a bar is going to pop up along
the bottom of the viewfinder,
and you're going to see a little arrow
and it's going to go left and right depending on
what you point your camera and focus on.
Now if it goes to the left into the negative territory
that means your settings are tuned so that the
camera is going to shoot something dark.
If the arrow goes to the right of the, the middle area,
that means your camera settings are showing
that it's going to be a bright image.
What you want to do is play a game where we get the
the arrow in the middle
so that you have a balanced exposure.
So let's use one example of how you're going to
use this light meter to get the picture you want.
So say I'm taking that portrait of my friend
right across from me, and I've decided because I want that
really nice shallow depth of field
and that blur behind him or her that I'm going to shoot
with like a 2.8, the max aperture available on my lens.
So I put the lens on, I'm shooting, I have it on 2.8.
My ISO is at a hundred where I want to keep it
low as possible.
And like I said before, you're going to half press,
when you find your focal point
you're going to half press this.
That allows your camera to start the metering mode.
Now you're going to keep it half pressed
as you keep it on your subject.
And it's going to show you, am I in the negative?
Am I in the plus side
and it's going to give you a good base
for which way you need to go.
Now, if I've decided that my aperture is going to stay
at 2.8 and the meter is showing me that I'm too bright
what do I do next?
Well, I'm going to take my finger off the shutter.
And I'm going to use the shutter wheel
to make my shutter speed faster,
meaning less light, right?
Because right now I'm too bright.
So I need to cut off some of that light.
Now the opposite is true if I'm shooting 2.8
and it's showing me that I don't have enough light
then I'm going to try to slow my shutter speed down.
I'm going to try to make that arrow go
from the right to the middle or the left to the middle.
And I'm going to do that using the shutter speed
because that's, because I've picked what aperture I want.
Now if I have a 2.8 and I can't go any wider on my aperture
and I'm at say one over 200
and I can't go any slower with my shutter speed
'cause I'm worried there's going to be some motion shake
in my picture.
Then the last thing I can do is my weapon of last resort.
Right?
I can grab my ISO and I can change that now to get,
to move the arrow back towards the middle.
So think about this.
We're keeping everything in harmony.
We pick where we want to start
off with whether that be aperture or shutter speed.
And then we manipulate the other factors,
ISO being the last one we touch in order to get that arrow
from the left or the right back into the center.
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- [Narrator] Thanks for watching.
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