Technical Control P3 (b)

Greater number has smaller Aperture and Smaller number has larger Aperture.

Aperture is a hole inside the lens,which control the amount of light get in through the lens.The larger size of the hole,the more light get into the lens,Therefore the photographs will be brighter.However if the hole get smaller,the picture will be dimmer than usual.

Depth of Field and the Aperture has a direct impact of the image.If the aperture is larger,The foreground and background will be isolate.Foreground will be focus and the background become blurry.However if the aperture is smaller,both foreground and background will be focus in the picture.

Shuttle Speed is the length of time a camera shuttle is open.It allows the time of light getting through the camera.The shorter time it is,the less light is reflect into the lens so it can easily freeze the high speed movement.The longer expose time allow more light reflect into the camera and the object become blurry to show to movement of object.Shuttle Speed is measure in second.It can take picture up to 30 seconds or down to 1/8000 seconds of exposed time.

ISO is the level of sensitivity of your camera to available light.Lower ISO,less sensitivity to light.Higher ISO,more sensitivity to light.While using high ISO can capture the image in a low-light environment without using flashlight.Using high ISO to capture image can cause gain or lost quality of the quality.

Task
I am ask to take photos of the Russian Dolls in AV mode of the camera.In the AV mode.I am only allow to change the size of the aperture and the amount of ISO in the camera.Using different size of aperture to show different effects of the picture.In this practise exercise,I have turned ISO into 2000 to stay constant and change the aperture manually.

 The first picture,I have used f/2.8 to take this photo.It isolated the background and objects,The object is been focus and the background is isolated.As the result,the image has a shallow depth of field and background is blurred.

 This is the second picture,compare to the first picture.This image had used aperture f/5.6 and ISO 2000,it was slightly dimmer as the aperture getting smaller and less light got into the lens.Also the background was getting clear than the first image.The depth of field got deeper.

 This is the third picture of the,I had used aperture f/11 which is getting smaller and smaller.Compare to the second picture and got slight dimmer and even less light through the lens,however the camera had change the shuttle speed for me to 1/12 which had longer expose time.Longer expose time means more light can travel through the lens to become brighter.

As the aperture getting smaller,the background become less blurry compare to first image.Also the shuttle is getting longer,to avoid the image get blurry,I have to put the camera on top of the table to avoid any shock movement while taking the image.

 This is the last image of Russian dolls.I had used aperture of f/22.It was about 8 time smaller than the first image.The background of the image is almost clear and can barely read the words behind it.As the aperture of the lens became really small,I shuttle time became really long.The longer expose time to allow more light to get into the camera to brighten the image.

Task 2) In this task,I have to take photo of a moving object under TV mode.In this mode I was only allow to change the shutter speed and the ISO.As this task was to find out how shutter speed can affect the find out come of the photograph,therefore I have turned the ISO into AUTO.

 Before taking photo of an moving object.I have took a few shot for testing.As I have set the shutter speed in to 1/50s.It was quite a long expose time under very bright environment.The result of this photograph is very bright and white as lots of sunshine get into the camera.

 1) For the first picture,The person was jumping up and down.I have set the shutter speed into 1/5s and the camera could caught the detail of the person under very long expose time.The result of this picture is very white and the person was blurred.

 2) The second picture,the shuttle speed was 2 times shorter than before.Now the cameral can slight catch the detail of the person while she was jumping around.Also the picture was slightly dimmer than before as the shuttle was shorter,less light was allow to come into the camera.

 3) It is the last image,now the shutter speed was 1/125s.It was the shortest time compare to the others.Now the camera could caught the detail of the person while she was jumping around.Also the background of the picture very detail and much dimmer compare to the second image.