Obviously the first question here is, what the heck is ISO!?!?
ISO (don't ask me what it stands for) is responsible for how sensitive your camera is to surrounding light. This little image on how to choose ISO is my favorite part of this course so far.
It's a cheat sheet! I love those! Don't know what your ISO should be? Look here! The big thing to remember with ISO is that the higher your ISO, the grainier your image will be. A higher ISO will create more "noise" and won't be as sharp, so you can't just leave your camera on a high ISO all the time (so don't be tempted to do that!).
Moving on to Shutter Speed ...
The shutter speed determines how long the opening in your lens is well... open. (Remember, aperture is about how big the opening is, shutter speed is how long it stays open.)
The longer the shutter is open the more light is let in, but it also means that any movement will show up in your photo as well. Movement = Blur! If you're shooting something that likes to move around - like kids, sports, or *ahem* dogs - using a higher shutter speed will allow you to "freeze" them in action.
This week's assignment was to capture how a change in shutter speed can change an image using something everyone has: running water in a kitchen sink.
The first photo shows a lot of motion. You can see the streams of water bouncing onto and off of the spoon.
ISO: 800, Exposure: 1/40 sec, Aperture: 8.0
By using a faster shutter speed, to can start to see the water "slow" down.
ISO: 800, Exposure: 1/80 sec, Aperture: 8.0
Using an even faster shutter speed, you see even more detail and now even see individual drops of water as they bounce away. You can even see the ripples of water on the bowl underneath.
ISO: 800, Exposure: 1/500 sec, Aperture: 8.0
ISO: 800, Exposure: 1/500 sec, Aperture: 4.0
And even faster ...
ISO: 800, Exposure: 1/1000 sec, Aperture: 4.0
Pretty cool, huh?
When I was done, I decided to try leaving the shutter open for a little longer (I'm still tripod-less so there's a limit to what I can do) and I was able to catch this shot.
ISO: 80, Exposure: 1/4 sec, Aperture: 8.0
Love this stuff! I think it's really interesting to see the difference a little shutter speed can make.
This lesson also drives home a huge take away for me: Photography is all about give and take. Higher ISO lets in more light, but you lose image clarity. A faster shutter speed can freeze fast motions, but you need a lot of light to make it happen.
This lesson also marks another big milestone - I'm shooting in manual!
