Seow Jie Yi (0318873)
Introduction to Photography
Exercise 2 Shutter Speed and ISO
LECTURE
In this week's class, Mr Vinod gave us some general feedbacks. After that, he started the lecture for the day. He explained to us about shutter speed and ISO during his lecture.
Shutter speed is the duration of time the shutter remains open to allow the light to reach the digital camera sensor. Shutter speed is measured in either seconds or fraction of seconds. He also mentioned that with the use of shutter speeds below 1/60th of a second, we will require the use of a camera support instead of hand holding the camera to prevent the camera from shaking.
This is an example of a photo taken using a very fast shutter speed.
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.
This is an example of a photo taken using a slow shutter speed.
A comparison between a photo taken using a very fast shutter speed and a slow shutter speed.
Exercise 2b Shutter Speed
Keep the fan speed at 1 and capture images using shutter settings from 1/4th of a second till 1/1000th of a second. Repeat this exercise after changing the fan speed from 1 to 2 and then from 2 to 3 and so on.
SCREENSHOT
2c.i. You will be required to shoot a subject using the lowest ISO setting to the highest. Determine the right exposure (shutter speed and aperture @ ISO 100) and then increase the ISO setting to 200, 400 and so on.
Marking Criteria: The student must capture the evidence of the shutter's ability to freeze fast moving objects and blur moving objects.
WORK
ISO: 200 Aperture: f8 Shutter speed: 1/10
ISO: 400 Aperture: f8 Shutter speed: 1/10
ISO: 800 Aperture: f8 Shutter speed: 1/10
ISO: 1600 Aperture: f8 Shutter speed: 1/10
ISO: 3200 Aperture: f8 Shutter speed: 1/10
ISO: 6400 Aperture: f8 Shutter speed: 1/10
2c.ii. Determine your exposure (shutter speed and aperture @ ISO 100) but this time, adjust the shutter speed and aperture to maintain the correct exposure as you increase the ISO.
Marking Criteria: The student must capture the evidence of degradation of image as the ISO increases in sensitivity. The student also must produce evidence that ISO can directly affect exposure.
WORK
ISO: 200 Aperture: f8 Shutter speed: 1/10
ISO: 400 Aperture: f8 Shutter speed: 1/25
ISO: 800 Aperture: f8 Shutter speed: 1/50
ISO: 1600 Aperture: f8 Shutter speed: 1/100
ISO: 3200 Aperture: f8 Shutter speed: 1/200
ISO: 6400 Aperture: f8 Shutter speed: 1/400
SCREENSHOT
FEEDBACK
General Feedback: Mr Vinod wants us to correct our mistakes that we did in our eportfolio. The mistakes that we did includes the feedback and reflection part which he told the class that most of us wrote it too briefly. The lecturer wants us to explain more about what we have observed and learnt in class as well as when we do our activities outside of the class.
Specific feedback: Mr Vinod told me that I did not write about reflections for the previous class in my eportfolio, which was what I have learnt during the class of week 3. Other than that, the lecturer said that the lecture part of my post was a little short and he wants me to explain more about the lecture in class and maybe add a few images that explains about the lecture.
REFLECTION
I have updated the reflection for my previous post and written down what I have learnt throughout the class. Other than that, I have learnt that using a very fast shutter is able to capture a fast moving object and the photo will seem as if the object is frozen in place Likewise, a slow shutter speed are used intentionally to capture the movement of an object which will be seen as lines in the photo.
I have also learnt from this exercise that if I increase or decrease the ISO without changing aperture or shutter speed, the photo will turn out either brighter or darker. Therefore, I have to make sure that the arrow of the light meter maintains at 0 to ensure that I get a good photo.
I used to only adjust either the aperture settings or the ISO settings and the camera will adjust itself for a good picture with the changes that I have made because usually I use automatic mode. But after learning the proper way of using aperture, shutter speed and ISO with only manual mode, I have gained more knowledge on how to change these settings in order to get a picture that I desire.
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