Lesson 3 : ISO and Shutter Speed

This week, Mr Vinod taught us about ISO and Shutter Speed

What is ISO??

-ISO is the number indicating a digital camera-sensors sensitivity to light

-The higher the sensitivity,the less light is needed to make an exposure

-Shooting at a lower ISO number requires more light than shooting at a higher  

  number

-Lower numbers result in images with the least visible noise,which is desirable

-The higher the number,the more noise

 

Conclusion...

 

Smaller ISO, less light sensitivity, more saturation, less grain.

Higher ISO, more light sensitivity, more contrast, higher noise level

 

 

 

SHUTTER SPEED

Shutter speed is the duration of time the shutter reamins open

Function : To allow light to reach a digital camera sensor

 

Shutter speed is measured in seconds,or fractions of seconds

 

Using very fast shutter speed "freeze" fast moving subjects

Slow shutter speeds are used to intentionally capture the movement of a subject

 

For most, hand holding a digital camera at shutter speeds below 1/60th of a second often requires the use of a camera support to prevent the camera from shaking

 

Here is the ISO exercise we conducted in class.The first exercise is done without manipulating anything else besides the ISO settings :)

 

                                                                          
                                                                            IS0 200

                                                                          IS0 400

 

   IS0 800

 

                                                      
                                                                         IS0 1600
 

For the second exercise, we had to maintain the correct exposure for all shots while manipulating the ISO settings

 

                                                                  S 1/2.5   ISO 200

                                                                   S 1/6   ISO 400

                                                                     S 1/13  ISO 800

 

S 1/20 ISO 1600

 

 

What did I actually learn from this exercise?. Well, I learned about how ISO can effect the brightness of a picture. Basically, ISO is similair to Aperture which is to increase the brightness of a picture.Now that I know what is the function of "ISO", I can apply it in daily life and take better photographs.Never did I knew such littles things like this can make a big difference to a photo :).

 

 

SHUTTER SPEED EXERCISE~

For this exercise,Mr Vinod told us to conduct it ourself at home. We were basically asked to take pictures of our ceiling fans at different fan speed/shutter speed. The fan speed will start from 1-5 and the shutter speed will be from 1" - 1/1000

 

Below is a screenshot of the exercise that I've conducted



 

 

Outcome of this exercise : As you can see, the fan starts to "froze" as the shutter speed decreases from 1" to 1/1000". This is to show that, pictures with slow shutter speed will tends to show movement wheras a picture with fast shutter speed will tend to "freeze" the object.

 

Doing this exercise really requires alot of patience!..AND I REALLY DO MEAN ALOT OF PATIENCE!!..I struggled trying to figure out how to position my DSLR on the tripod.It took me quite some time till I found out the correct angle for taking the ceiling fan shots. Another grueiling part about this exercise was actually tilting my head just to look at the camera screen.. hahaha.. this really made me get a neck ache when I completed the exercise.