Niew Seen Ying (0304125)
Introduction to Photography
Exercise 2 : Shutter Speed & ISO
Lecture
Before the class, Mr. Vinod shared some links and videos regarding shutter speed and ISO. After that he explained about shutter speed and ISO and the effects of them on the quality of pictures.
Shutter speed is the duration of time the shutter remains open to allow light to reach a digital camera sensor.
Shutter Speed:
-Shutter speed is measured in seconds, or fractions of seconds.
-Using very fast shutter speeds “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 1/30th of a second often require use of a camera support to prevent camera shake.
When considering what shutter speed to use in an image you should always ask yourself whether anything in your scene is moving and how you’d like to capture that movement. If there is movement in your scene you have the choice of either freezing the movement so it looks still or letting the moving object intentionally blur giving it a sense of movement.
To freeze movement in an image like in the surfing shot above you’ll want to choose a faster shutter speed and to let the movement blur you’ll want to choose a slower shutter speed. The actual speeds you should choose will vary depending upon the speed of the subject in your shot and how much you want it to be blurred.
ISO is the number indicating a digital-camera-sensors sensitivity to light.
ISO:
-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.
After the lecture, he gave us 2 exercise. We did the ISO exercise in class and we are required to complete our shutter speed exercise at home.
Instructions
Exercise 2b (Shutter Speed)
1. Keep the fan speed at 1 and capture images using shutter settings from 1/4th of a second till 1/1000th of a second.
2. Repeat this exercise after changing the fan speed from 1 to 2 and the from 2 to 3 and so on.
Reflection
Through this exercise, I understand that a fast shutter speed freeze a moving object and a slow shutter speed captured the motion of an object. By comparing a low shutter speed image to a higher one, I could see that the fan which was taken with a fast shutter speed and high ISO appeared clearer than the image that was taken with low shutter speed and low ISO.
Reflection
Through this exercise, I understand that a fast shutter speed freeze a moving object and a slow shutter speed captured the motion of an object. By comparing a low shutter speed image to a higher one, I could see that the fan which was taken with a fast shutter speed and high ISO appeared clearer than the image that was taken with low shutter speed and low ISO.
Screenshot
Exercise 2c(i) (ISO)
1. You will be required to shoot a subject using the lowest ISO setting to the highest.
2. Determine the right exposure (shutter speed & aperture @ ISO 100) and then increase the ISO setting to 200, 400, and so on.
F5.6 |S1/15 |ISO 200
F5.6 |S1/15 |ISO 400
F5.6 |S1/15 |ISO 800
F5.6 |S1/15 |ISO 1600
F5.6 |S1/15 |ISO 3200
F5.6 |S1/15 |ISO 6400
Reflection
From this exercise, I realised that when I increases the ISO, the photos appears brighter with greater exposure. Throughout this exercise, the shutter speed used is the same and that makes me learnt that when the ISO increases, the exposure of the photos increases.
Screenshot
Screenshot
1. Determine your exposure (shutter speed & aperture @ ISO 100) but this time adjust the Shutter & Aperture to maintain the correct exposure as you increase the speed of the ISO.
F5.6 |S1/15 |ISO 200
F5.6 |S1/30 |ISO
400
F5.6 |S1/60 |ISO
800
F5.6 |S1/125 | ISO
1600
F5.6 |S1/250 |ISO
3200
F5.6 |S1/500 |ISO
6400
Reflection
Throughout this exercise, we are required to adjust our shutter speed and ISO to get the right exposure. For this exercise, I don't really saw the differences between the photos. But when i compared the first photo and the last photo, I found out that the photo with smaller ISO seems to be clearer then the photo with higher ISO. Thus I understand that when the ISO increases, the noise increases which makes the photo seems blur.
Feedback
General Feedback
Mr. Vinod asked us to go through the reading materials and video he post on facebook. He said that it is a better thing to come for a lecture with prior knowledge of the lesson. He also questioned us about the difference between and ISO, shutter speed and aperture as it is related to our next lesson, zone system.
Specific Feedback
The exercises by and large seems correct. Mr. Vinod suggested to include the materials I had gone through in the lecture part to show the effort thrown in for every lesson.
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