Cheap Digital and Film Cameras
Cheap cameras, whether digital or film based work in much the same way as their more expensive counterparts often the difference will lie in features and the quality of the manufacture . In this site we will try to give you information to help you in your choice of camera equipment. Whether you do then buy a cheap camera or more capable more expensive camera will probably be down to your requirements and affordability.
Technological advances are constantly changing, almost as much as time itself it seems. It was less than thirty years ago that Bill Gates introduced Microsoft to consumers with Apple's computers being slightly older. As technology advances, film cameras are becoming less convenient. Digital Camera usage is on the rise due to their convenience to the consumer and businessman. You no longer need to wait for film to be printed, but rather you are able to observe your images instantaneously. In a society that is constantly moving and with more and more people taking their office with them in the form of smart phones, the advent of the digital camera is pure gold.
The basics of how the digital camera works are similar to that of a computer. They both process information in the form of bits and bytes, a continuous stream of ones and zeroes that the digital computerized devices translate into data. In the case of a computer, the data varies and in the case of a digital camera that is the photograph just taken. There are several steps and processes that go into the detailed account of how the ones and zeroes are turned into the data.
The stream of data that we are referring to is what produces the pixels of the image. Collectively they take form to reproduce what is seen through the camera's lens. The light variations produce the different ones and zeros that become the pixels and the sampling is given to us through the lenses as they focus the light to create the scene in front of the photographer. Semiconductors within the camera body record the light electronically with the computer breaking down the electronic information into digital data while making use of the various features that digital cameras have to produce the truest image possible.
CCD and CMOS devices complement the semiconductors. The charge coupled device (CCD) is the most prevalent while the complementary metal oxide semiconductor (CMOS) is beginning to gain ground. The CCD sends the charge across the chip while reading one corner of the array. An ADC (analog to digital converter) will take the value of each pixel by measuring the charge of the electrons on each photosite to convert the digital to binary form. CMOS will use multiple transistors for each pixel as a way of amplifying the charge between the semiconductor's wires.
Once the data is collected, detail is of the utmost importance. Resolution, in the digital world, is the amount of detail in the image. The largest amount of pixels collected will give you the highest resolution. A typical breakdown is as follows: the cheapest digital camera will be 256x256 resolution with only 65,000 pixels; low end cameras purchased for mostly emailing images comes in at 640x480; the lowest megapixel (MP) is 1.3 which is 1216x912; high res cameras start at 1600x1200; 4MP swings in at 2240x1680 and the top of the line digital camera is 4064x2704 with 11.1MP wherein you can produce huge wall portraits without losing quality.
Your digital camera is monochromatic, seeing only black and white. Color is produced by the intensity of the light that strikes each photosite's surface. The camera filters for the three primary colors of red, green and blue. The data is collected to form the full spectrum of light and color to attribute to the image so that we may see it in full color. High-end cameras will use a beam splitter that will direct the light to different sensors wherein with the filters in place, each sensor will in turn respond to only one of the primary colors. There is also a rotational system used by some camera with the RGB filters falling in front of a single sensor. Three rapid succession images are recorded with all three colors at each pixel's location. Therefore, this is a less preferred method since the subject would need to remain still throughout all three shots. Lower end cameras work with demosaicing algorithms for their color filters. A color filter array is permanently located over the photosites making it possible for enough information to be accumulated near each sensor to guesstimate the color (interpolation). There are different filtering patterns used, as well.
The Bayer filter pattern is the most prominent. Alternating red-green, blue-green rows are used for what we perceive as true color on the photograph. The Bayer filter is a perfect technique when only one sensor is present. X3 is also used on single sensor cameras. With X3 RGB are embedded into the silicon.
Focusing an exposure are two other keys to good photography. If one or the other is off, then no filter will be able to correct a mistakenly bad image. The aperture is the opening of the lens on the camera and it is measured in F-stops. The shutter speed is the amount of time the shutter is left open. If one is off from the other, then the image will be too dark or too light since the exposure of light to the sensor will be incorrect. The focal length is the point of focus from the lens to the sensor as well as the magnification of the subject you are shooting. Four types of lenses are used with digital photography.
Fixed focus and fixed zoom lenses will be found on the lowest end camera, sometimes referred to as the throwaway disposable camera. The consumer has no control over the focal point beyond the distant the photographer is from the subject. Optical zoom cameras come with automatic focus features and can be found in wide or telephoto formats. Digital zoom is done on the sensor, not through the camera lens; therefore you need to crop closer by way of software rather than the camera. Some digital SLRs will actually use replaceable lens systems much like you find on traditional 35mm film cameras. These lenses would allow the photographer to adjust to different focal points by way of switching out the lens from the camera rather than within the camera or software.
Lastly, digital images from the camera are stored on various forms of flash memory, smart cards, compact flash cards or memory sticks. Some cameras are synced to the computer for storage on the hard drive. Most cameras will allow you to save images as RAW (proprietary format), JPEG and TIFF – sometimes simultaneously. All digital cameras allow for JPEG. RAW is the highest form of image, followed by TIFF and JPEG.