Wednesday, February 11, 2015

Day 10: Shutter Speed Expanded

So. We now know what the aperture does. Set one way, tons of light and shallow Depth Of Field; the other less light and wider DOF.
Now the SHUTTER. Set with the S or TV dial, it is the duration of time that the shutter is open, letting available light into the sensor. Mainly, it controls movement. Here, I have a ceiling fan. The fan is set for it's slowest speed, so I set the shutter for 1/500 of a second.

 Very fast. It captured the blades in mid flight, but still gave a dark image, due to the fact that not a whole heck of light was allowed in Maybe I should have used a slower shutter...


After resetting my shutter to 1/3 of a second, you can see a lot of light came in, but it is overly bright and you can't see the blades at all.
So what can be done?
The S/TV setting allows you to set the shutter speed to whatever you want - within the cameras limitations - to capture movement or stillness.  Just like A/AV setting, YOU set the shutter speed and the camera sets an appropriate aperture base on available light.  But as you can see, the exposures look very different in this example.  Why? Because of the ISO setting.  That will be tomorrows post.