Week 2's lesson is about ISO and shutter speed. ISO is essentially film speed- or a setting to determine how quickly an image will be captured by either the film or digital sensor. The setting of ISO you select depends on how much light is available in your shooting environment. If you are outside and it is a bright sunny day, you can set it to 100-200, but if you are inside in low light, you will want to increase it to 800-1600 to compensate. Now, there is a tradeoff for shooting with such a high ISO, that is the higher the ISO, the more digital noise- or film grain is captured in your picture. Since the camera is capturing the image so quickly, it does not have time to be accurate so the image will not be as sharp. Shutter speed is how quickly the shutter opens in front of your image sensor. You will want fast shutter speeds to freeze action- like if you were shooting at a nascar race, you would want to ramp up the shutter speed to 1/1000 of a second to freeze the car in action. You can use a slow shutter speed to depict the motion of an object against the stillness of its surroundings. There are lots of cool photos out there of cars driving though NYC or Vegas for example, and all you see are the headlights of the cars, but the building, bridge or whatever the main focus of the picture is, is clearly in focus. The important thing to remember is that all three things - aperture, ISO, and shutter speed - control how much light is let into your camera. The goal is to balance these three things to find the correct exposure and capture a great image!
So for my examples, I shot water at 2 different shutter speeds from the kitchen faucet. I kept the ISO at 1600 since I was indoors and don't have much light in the kitchen.
Here, the shutter speed was 1/60 of a second. As you can tell, it is not fast enough to visually stop the flow of water
This one was taken at 1/1000 of a second and you can see here that the water droplets appear to be frozen since I was using a fast shutter speed. The examples illustrate this better I think
1/60 of a second- flowing water
1/1000 of a second- frozen water
I had never changed the shutter speed on my camera before last week, so this was fun to try out.
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