What is it?

In photography, the shutter speed or the exposure time is the length of time that the digital sensor inside the camera is exposed to light when taking a photograph. The amount of light that reaches the film or image sensor is proportional to the exposure time. 1/500 of a second will let half as much light in as 1/250. This gives the effect of either a fast or slow shutter speed, enabling photographers to experiment more with the type of photography they do.

Slow Shutter Speed

This is when the time of the shutter speed is longer to allow more light to be captured, this as a result makes the image less sharper and more lighter. it also often refers to a larger fraction of a second, such as ½ or ¼. Slow shutter speeds can capture movement and introduce blur, usually for slower moving subjects. Long shutter speeds are typically around one second or longer. This gives a example like this:

Medium Shutter Speed

This is when the shutter speed is in between a slow and high shutter speed as is around a shutter speed such as 1/250 to 1/30 sec. This is a middle ground, this mean the image is neither too bright or too dark but still gives the effect of a blurring/moving image, for example a medium shutter speed is used to blur a person running or animal giving the impressions of fast movement.

Fast Shutter Speed

Fast shutter speed is when you take a photo to 1/500th to 1/4000th of a second, This gives the image a sort of stuck in time effect with minimal or no blur at all. Fast shutter speed is often used to capture rapid moving objects or animals, this is so you get a clean image of a subject that would otherwise be blurred. But when you are using fast shutter speed the photo will be dark and lacking contrast. If you need a high shutter speed then you can compensate it with the aperture or if you don’t want to change that then you can increase the ISO value.

How the images were achieved

For the first image of slow shutter speed, I went outside the school and took pictures of cars going past. With the use of a slower shutter speed it made the cars look almost like a blur while the background stayed clear. This gave the illusion of the car going faster than it was. In the second picture it a gives and cool effect via the medium shutter speed, this is because only the legs are blurry but still not too blurry, this gives the idea of movement but only minimal. And with the third and final image it was just quite simple and shows a clear example of Freddie walking, but as it was a fast shutter speed, you are unable to see any type of blur even though he is moving.

What is ISO? How does it affect your camera?

ISO controls the amount of light your camera lets in, and therefore how dark or light your photos will be and how sensitive your camera sensor is to light. The higher the ISO number, the higher your camera’s sensitivity, and the less light you need to take a picture. The trade off is that higher ISOs can lead to degraded image quality and cause your photos to be grainy or “noisy.”

What does a high ISO / low ISO mean? What effect can this have on your photos? What is meant by visual noise?

The higher the ISO number, the less light is needed and the more grainy a image is. The lower the ISO number, the more light is needed to properly expose the image, this makes the image smother and more detailed but is darker. The higher the ISO number, the higher your camera’s sensitivity, and the less light you need to take a picture. The trade-off is that higher ISOs can lead to degraded image quality and cause your photos to be grainy. The higher the ISO, the more amplification your sensor needs, and the more noise you will see in your image.

When might you want to use a high ISO?

High ISO is generally well suited to low-light situations, especially when a fast shutter speed or a narrow lens aperture is essential to achieving a creative goal. Using a higher ISO setting for hand-held street photography at night allows one to use fast shutter speeds to create bright, sharp images.

Exploring the effects of ISO

As you can see in these photos, there is a clear difference between which image is lighter and darker, this is determined by the amount of ISO used. In the top photo I used a lower ISO, in which made the photo a lot darker and more accurate to how light it really was in the studio. In the bottom photo I used a moderately high ISO, this is because I didn’t want the image to be too bright but still wanted to add more detail and to see what was in the actual image. Also if you look close enough you can see the grain that I mentioned in the blog. I could prevent this to make a more clearer image by decreasing the shutter speed, but with this I would have to keep the camera steady to reduce blur.

Final images:

Camera Obscura

The camera obscura is a device that is sort of an early version of a camera. It works on the principle of letting light through a small hole, therefore projecting everything upside-down outside on a surface inside a dark room. People figured out this trick as far back as ancient times, first mentions coming from the Chinese and Greek. It wasn’t until the Renaissance, however, that it really hit its stride with the help of artists and scientists who used the device to study the way light and perspective function. For many centuries, it was an essential tool for artists and scientists alike, and eventually some of its concepts would be used to create photography as it stands today.

Nicephore Niepce

Nicéphore Niépce is generally considered an early pioneer in photography who invented the first photography procedure that worked. He captured what has come to be considered the world’s first permanent photo, View from the Window at Le Gras, using a photography method called heliography. Until recent times, however, Niépce was not widely credited as the first photographer. His work was then overtaken by Louis Daguerre, who perfected the process and made it famous with the daguerreotype. For this reason, Daguerre was considered the major developer of photography, while the role of Niépce was brought out fully only much later.

Henry Fox Talbot

Henry Fox Talbot perfected the early photographic process known as Photogenic Drawing, where he placed an object directly onto light-sensitive paper and exposing to sunlight created a silhouette or “drawing” of that subject. This was an important step in photography’s development since now multiple prints could be realized. Talbot also used small wooden cameras small enough to hold in one’s hand-whom he referred to as “mousetraps.”. These cameras incorporated a lens that focused the light onto the light sensitive paper inside to create a negative image. He could put the negative on another sheet of paper and make positive copies, a technique which would set the stage for modern photography.

Daguerreotype

Daguerreotype was a process invented in 1839 by Louis Daguerre. In this process, pre treated polished silver coated copper plate was exposed to iodine vapours to make it photosensitive and then to light followed by development in mercury fumes. This would give highly detailed but unique images on a reflective surface. This yielded an extremely sharp image but with a great limitation. Each photograph was unique and unrepeatable, the process being cumbersome and hazardous since it incorporated mercury. Henry Fox Talbot’s system incorporated negatives in combination with Photogenic Drawing to allow for multiple copies of an image, Talbot’s method was thereby more practical and adaptable for wide use.

Richard Maddox

Richard Maddox was an English photographer who invented the dry plate process in 1871. Before his invention, photographers used wet plates that had to be prepared and exposed while still wet, which was cumbersome and time-consuming. Maddox’s dry plates were coated with a gelatin emulsion that could be stored for longer periods and didn’t require immediate development. This innovation made photography much more practical, as it allowed photographers to prepare their plates in advance and develop them later, greatly increasing flexibility and convenience. Maddox’s dry plate process was a major leap forward for photography, paving the way for the development of modern photographic films and making photography more accessible and efficient for both professionals and amateurs.

George Eastman

George Eastman changed photography by making the photo camera accessible to all. Before his improvements, photography was rather complicated and required very expensive equipment. Eastman managed to change that with his invention of the Kodak camera in the year 1888. Such a camera was easy to use; it was preloaded with films and allowed people to take their photos and then send the entire camera to Kodak for developing and printing. This slogan coined the “You press the button, we do the rest” approach, making photography easy and within the economic reach of the general masses. In this process, he established a company known as Eastman Kodak Company, which soon emerged as a multinational photographer company and played a very important role in popularizing photography as one of the characteristics of everyday life.