Presentation is loading. Please wait.

Presentation is loading. Please wait.

Pillars of Photography Shutter Speed and ISO. Shutter Speed Controls how long the camera’s “eye” is open. Controls how long the camera’s “eye” is open.

Similar presentations


Presentation on theme: "Pillars of Photography Shutter Speed and ISO. Shutter Speed Controls how long the camera’s “eye” is open. Controls how long the camera’s “eye” is open."— Presentation transcript:

1 Pillars of Photography Shutter Speed and ISO

2 Shutter Speed Controls how long the camera’s “eye” is open. Controls how long the camera’s “eye” is open. Measured in fractions of seconds, minutes or hours Measured in fractions of seconds, minutes or hours 1/60 th of a second, 1/2000 th of a second, etc 1/60 th of a second, 1/2000 th of a second, etc Fast shutter speeds will literally stop motion. Fast shutter speeds will literally stop motion. Water drops can be caught in mid air Water drops can be caught in mid air Slow speeds will cause motion to blur Slow speeds will cause motion to blur Water in a stream can be made to look like milk. Water in a stream can be made to look like milk.

3 Types of shutters There are three basic types of shutters There are three basic types of shutters Electronic Shutter Electronic Shutter No moving parts, the sensor simply applies power when the release is depressed and begins to record the image for the amount of time specified by the cameras computer. No moving parts, the sensor simply applies power when the release is depressed and begins to record the image for the amount of time specified by the cameras computer. Leaf Shutter Leaf Shutter Often referred to as an Iris, or Diaphragm Shutter; this mechanical device copies the action of your eye through overlapping metal leaves. Often referred to as an Iris, or Diaphragm Shutter; this mechanical device copies the action of your eye through overlapping metal leaves. Normally employs an odd number of leaves. (3, 5, 7, etc) Normally employs an odd number of leaves. (3, 5, 7, etc)

4 Types of shutters Focal Plane Shutter Focal Plane Shutter Most commonly used with DSLR, (Digital Single Lens Reflex), Cameras. Most commonly used with DSLR, (Digital Single Lens Reflex), Cameras. When release is depressed, the Front, (or First), curtain moves over the sensor until it is fully open. When release is depressed, the Front, (or First), curtain moves over the sensor until it is fully open. Once the shutter has been open for the desired amount of time, the Second, (or Rear), curtain begins to move until the sensor is again fully concealed. Once the shutter has been open for the desired amount of time, the Second, (or Rear), curtain begins to move until the sensor is again fully concealed. Advanced shutter control is often called “First Curtain Sync”, or “Second Curtain Sync” Advanced shutter control is often called “First Curtain Sync”, or “Second Curtain Sync”

5 Shutter Priority Taking control

6 Shutter Priority TV, (Time Value), for Canon TV, (Time Value), for Canon S, (Shutter), for Nikon S, (Shutter), for Nikon Tells the camera that you are going to select the shutter speed, the camera can control the aperture, and if needs be, the ISO. Tells the camera that you are going to select the shutter speed, the camera can control the aperture, and if needs be, the ISO. Shutter speed is the most important thing in this image. Shutter speed is the most important thing in this image.

7 Long shutter speed Often referred to as a long exposure Often referred to as a long exposure Normally requires a tripod Normally requires a tripod Allows for deep depth of field Allows for deep depth of field Captures motion as motion Captures motion as motion Normally requires a smaller aperture (F16 – F22 for example) Normally requires a smaller aperture (F16 – F22 for example)

8 Fast shutter speed Can be easily hand held Can be easily hand held Allows you to stop motion Allows you to stop motion Normally uses a wider aperture (F2.8 – F 5.6 for example) Normally uses a wider aperture (F2.8 – F 5.6 for example) Normally will result in a shallower depth of field. Normally will result in a shallower depth of field. Often used in sports or action shots. Often used in sports or action shots.

9 The pitfall Shutter speed priority will allow you to quickly select a value that can slow or stop time quickly. Shutter speed priority will allow you to quickly select a value that can slow or stop time quickly. Problem is that you may not have an aperture setting to allow a proper exposure. Problem is that you may not have an aperture setting to allow a proper exposure. While Shutter speed priority is handy at times, it could result in underexposed images. While Shutter speed priority is handy at times, it could result in underexposed images.

10 Shutter Speed Questions?

11 Break 15 minutes

12 ISO (ASA) Speed vs quality

13 What does it mean ISO, is an acronym that stands for the International Standards Organization. It was formerly known as ASA, (American Standards Association). ISO, is an acronym that stands for the International Standards Organization. It was formerly known as ASA, (American Standards Association). This is an expression of how sensitive a sensor, or film, is to light. This is an expression of how sensitive a sensor, or film, is to light. Normal expressions are: Normal expressions are: 100, 200, 300, 400, 500, etc, etc 100, 200, 300, 400, 500, etc, etc Each step is twice as sensitive to light as the last. Each step is twice as sensitive to light as the last. Problem with higher ISO is greater incident of grain in your image. Problem with higher ISO is greater incident of grain in your image. Lower ISO generally makes for a cleaner image. Lower ISO generally makes for a cleaner image.

14 High ISO Pumping up the ISO value will make your sensor more sensitive to light, this will allow you to take pictures in darker areas without the need of a flash. Pumping up the ISO value will make your sensor more sensitive to light, this will allow you to take pictures in darker areas without the need of a flash. This is useful in sports arenas, birthday parties and museums where using a flash is unwelcome, or of no use. This is useful in sports arenas, birthday parties and museums where using a flash is unwelcome, or of no use. The price you have to pay for a higher ISO is that your image will be more grainy. The price you have to pay for a higher ISO is that your image will be more grainy. Modern digital cameras are making headway regarding this issue, however a difference can still be detected by the human eye on 90% of high ISO shots. Modern digital cameras are making headway regarding this issue, however a difference can still be detected by the human eye on 90% of high ISO shots.

15 Advantages of High ISO Higher ISO will allow you to use a faster shutter speed. Higher ISO will allow you to use a faster shutter speed. Useful if you do not have a tripod, or you are at a sporting event where the use of a tripod is impractical. Useful if you do not have a tripod, or you are at a sporting event where the use of a tripod is impractical. Taking pictures at a birthday party when they are blowing out candles; a flash will ruin a shot like this. Taking pictures at a birthday party when they are blowing out candles; a flash will ruin a shot like this. You intentionally want the grain in the shot for artistic reasons. You intentionally want the grain in the shot for artistic reasons. Taking pictures in a confined area where only hand holding will work and flash will be too powerful. Taking pictures in a confined area where only hand holding will work and flash will be too powerful. i.e: Home inspection of an attic. i.e: Home inspection of an attic.

16 Example of High ISO Shot in mixed light Animal was moving quickly, so higher ISO was needed to support higher shutter speed at lower light. Settings: ISO: 400 Shutter Speed: 1/2000 Focal Length: 200mm Aperture: F4 This could normally be accepted as a decent photograph, look closer, the higher ISO shows itself.

17 Grain Bringing the image to 100% shows the grain in the image. This amount of grain is often deemed “Not acceptable” by most professional photographers, however to someone not in the field, they would likely not care unless they had something to compare it to. NORMALLY, this amount of grain would not be as visible in a physical print.

18 Slower ISO You will require a longer shutter speed, as the sensor or film is not as sensitive to light. You will require a longer shutter speed, as the sensor or film is not as sensitive to light. Depending on your situation, a tripod or other support will be needed or else your image will be blurry. Depending on your situation, a tripod or other support will be needed or else your image will be blurry. Your heartbeat can be enough to blur a shot. Your heartbeat can be enough to blur a shot. Cleaner image, less grain. Cleaner image, less grain. Not always the best choice for moving objects. Not always the best choice for moving objects.

19 Advantages of Slower ISO Better detail Better detail Some cameras may find better color (Not always) Some cameras may find better color (Not always) Little or no grain. Little or no grain. Using a tripod will allow you to gain massive depth of field for landscape shots Using a tripod will allow you to gain massive depth of field for landscape shots Useful for making star trails or light painting Useful for making star trails or light painting Best for reproduction or art shots. Best for reproduction or art shots.

20 Slowing it down ISO: 100 Focal Length: 135mm Shutter speed: 1/30 th of a sec Aperture: F 5.6 Clear and tack sharp, the lower ISO allows for much finer grain and recording of detail. The cost of that detail is the speed of the shutter, this image had to be shot at 1/30 th of a second, which is too slow to hold by hand, even with the use of strobes. Let’s take a closer look.

21 Up Close Grain is significantly reduced due to the lower ISO. Detail is much sharper. The price to be paid however is a shallower depth of field as we needed to open the aperture to get as fast as 1/30 th of a sec. Any slower and the subject would likely have blurred due to breathing or blinking.

22 ISO Questions?


Download ppt "Pillars of Photography Shutter Speed and ISO. Shutter Speed Controls how long the camera’s “eye” is open. Controls how long the camera’s “eye” is open."

Similar presentations


Ads by Google