Basic of Digital Photography

In 1981 Sony introduced the first DSLR camera which has revolutionized how we take pictures.  It is quite possible to eliminate a professional photographer from any event because the technology is allowing amateurs and even kids to take quality images with their phone. Devices such as the smartphone, computer. There were so many areas of photography that only professionals would venture like portrait, fashion, wedding, advertising and even journalism. Now megapixels on a pocket camera are not even required and anyone can have quality prints without a professional or a lab.

DSLR is the term used for digital cameras that use mirrors within the camera. I mean Digital Single Lens Reflex. SLR’s uses photographic film (made of plastic gelatin) to record its images and the information is recorded digitally on a memory card with the DSLR. Both allow the photographer to change lenses for different effects.

Having digital recordings of the images also meant that the pictures can be viewed on most electronic devices with a monitor and be printed on an inkjet at home instead of on photographic paper in a darkroom. There is no processing time and it can be printed over and over again. They can be saved digitally forever or can be deleted off the card to make room for more pictures.

Previously and very rarely now, SLRs would record images onto a very tiny strip of plastic made with halide crystals.  A chemical reaction occurs when exposed to light and the film needs to be taken to a lab where heavy chemicals are used to convert what’s on the film to paper or convert to digital images. It is not reusable.

The first set of DSLR cameras had poorer picture quality than film SLRs but since the introduction of megapixels, there is hardly any difference.

The shutter is like a door on the lens of the camera that opens to allow the light reflected and recorded.  The selected speed determines how long that door stays open, also known as exposure time. The faster or quicker the door opens and shuts means that a lesser number of versions of the photographed subject is recorded in an instance creating a clear sharp image of a moving subject.  The slower the speed a type of motion blur is recorded along the line of movement of the subject.

Shutter speed depends on the type of camera. Early SLRs typically have a speed

of 1 to 1/400th a second to 1/1000th of  a second. The high-end cameras can now have a shutter speed as high 1/8000 above.

Both DSLR and SLR cameras use an optical viewfinder to take pictures but some DSLRs now come with LCD viewfinders. There are many situations  where the viewfinder is a better choice when the viewfinder cannot be used, like in underwater photography.

Both DSLR and SLR cameras are similar in that they have several setting that the

photographer controls and without a good understanding or experience of what they are can be difficult to use. However, they allow the photographer to preview the image or take multiple

images without wasting film. They also are made with presents already built in for

different scenarios, permitting people with limited knowledge of the camera to take decent pictures.

DSLRs also allow the photographer to preview the image after it has been taken, and make it easy to upload the photo to a computer. They also require maintenance in keeping the lens and sensor clean and dust-free.  

If you want more in information about the difference of DSLR and SLR Click Here.

Aperture is in the eye of the camera the receives the light reflected from the subject image, like the iris of the human key. A wider aperture (or lower f-number) means more light will be let in by the lens, simply because the opening is larger. A narrow aperture (or higher f-number) allow less light to reach the sensor. The f-number is determined by the depth of field and maybe the effect the photographer is trying to achieve. A narrow aperture (higher f-numbers) give a greater of the field, allowing more of a scene to be in focus (think landscapes). Wider apertures (lower f-numbers) create a narrow depth of field, which can help isolate a photographed subject by blurring the background.

The ISO determines the camera’s sensitivity to light. Increasing the ISO allows the photographer to work with less light of a light source (like at night). However, increasing an ISO means increased ‘noise’ and less detail in the recorded image. Noise is the result of random fluctuations in an electrical signal. At lower ISOs, the image signal is larger relative to the noise (signal to noise ratio), meaning the noise generally remains unobtrusive.

Sometimes, when working in lower light, the photographer may be using the widest possible aperture and the slowest shutter speed and still not get a good quality picture. At this point, the only choice is to increase the ISO. A grainy image that shows a well-defined subject may be better than a smoother image with a subject lost in the blur.

The specific combination of aperture, shutter speed, and ISO is referred to as the exposure value (EV) indicating the change that either double of halves the amount of light reaching the camera sensor.

The right EV is determined by what the photographer wants the end shot to look like, the conditions under which the subject is being shot, the light source or sources, whether the photographer is using a tripod or not, the distance of the subject from the camera and whether the subject is moving or not. Having a camera sit still on a tripod can stabilize the image allowing the photographer to get away with a slower shutter speed. Camera shake and subject motion are two different things required different settings for quality shots.

If you need to now how ISO, Shutter speed, or aperture works.And how they work differently. You can see the result how each one turns out. For more information Click Here.


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