This is to show the relationship between the shutter speed set on the camera, the lens aperture or f-stop and the sensitivity setting of the sensor or ISO (International Standard Organization).
A low or long shutter speed will enable a large amount of light to reach the sensor but a high or short shutter speed will allow a smaller amount of light onto the sensor.
The iris of the lens can be opened or closed again to regulate the amount of light going through to the sensor. A small aperture of f/22 allows a small amount of light to pass but a large or wide aperture of f/2.8 will allow a large amount of light to reach the sensor.
The sensitivity or ISO of the sensor which will be a CCD (Charge Coupled Device) or CMOS (Complementary Metal Oxide Semiconductor) can be controlled to make to sensor more or less sensitive to light. A low ISO of 100 will give a high quality image but as the ISO is increased the amount of noise or grain on the image will increase and reduce the quality of the image. If a large print is needed of the image, a high quality photograph is required because as the image is enlarged the imperfections will show on the print.
A low or long shutter speed will enable a large amount of light to reach the sensor but a high or short shutter speed will allow a smaller amount of light onto the sensor.
The iris of the lens can be opened or closed again to regulate the amount of light going through to the sensor. A small aperture of f/22 allows a small amount of light to pass but a large or wide aperture of f/2.8 will allow a large amount of light to reach the sensor.
The sensitivity or ISO of the sensor which will be a CCD (Charge Coupled Device) or CMOS (Complementary Metal Oxide Semiconductor) can be controlled to make to sensor more or less sensitive to light. A low ISO of 100 will give a high quality image but as the ISO is increased the amount of noise or grain on the image will increase and reduce the quality of the image. If a large print is needed of the image, a high quality photograph is required because as the image is enlarged the imperfections will show on the print.
The images were taken on a windy day to show the effect of a low shutter speed.
Image 1
Low ISO of 100, wide f-stop of f/2.8 and low speed of 40th sec
This has given an over exposed image because of the wide f-stop and low shutter speed which has given too much light even with a low ISO of 100. If the ISO had been any higher the image would have been burnt out like image 5.
Low ISO of 100, wide f-stop of f/2.8 and low speed of 40th sec
This has given an over exposed image because of the wide f-stop and low shutter speed which has given too much light even with a low ISO of 100. If the ISO had been any higher the image would have been burnt out like image 5.
Image 2
Low ISO of 100, small f-stop of f/22 and low speed of 1/4 sec
This combination has given the right exposure but due to the very low shutter speed there is movement because of the windy day.
Image 3
Low ISO of 100, wide f-stop of f/2.8 and high speed of 1000th sec
With a low ISO of 100 there was not sufficient light even with a very large f-stop of f/2.8 because of the high shutter speed of 1000th second so the image is very dark.
Image 4
Low ISO of 100, small f-stop of f/22 and a high speed of 1000th sec
Not sufficient light has got to the sensor to produce a image due to the combination of a low ISO, a small f-stop and high shutter speed.
Image 5
High ISO of 1600, wide f-stop of f/2.8 and low speed of 40th sec
This combination has given an over exposed image due to a high ISO and very wide f-stop of f/2.8 so a much higher shutter speed was required to keep the image from being over exposed.
Image 6
High ISO of 1600, small f-stop of f/22 and low speed of 30th sec
The exposure is good because the high ISO has been balanced against a low speed of 30th of a second but this has given movement due to the windy day.
Image 7
High ISO of 1600, wide f-stop of f/2.8 and high shutter speed of 1250th sec
This high ISO with a wide f-stop of f/2.8 and a high speed of 1250th sec has produced a well exposed image but with a very limited depth of field.
Image 8
High ISO of 1600, small f-stop of f/22 and high speed of 1250th sec
This combination has not given sufficient light to the sensor to produce an image.
Image 9
High ISO of 1600, f/3.2 and high speed of 1000th sec
The image has the correct exposure but the speed has had to be increased to 1000th second to compensate for the high ISO.
Image 10
Low ISO of 100, wide f/2.8 and low speed of 100th sec
This is just to show that compared to the image above this is also the right exposure but to compensate for the low ISO the speed had to be reduced to 100th second.
No comments:
Post a Comment