26 January 2009
Mp3 Player Purchase Tips
The idea of a having a portable audio player dates back many years ago, when the option then was a fairly big cassette-tape-playing two-speaker audio system. Eventually these devices got smaller and back in the late seventies a hand size cassette-tape audio player was made available. Now as electronics evolved and with the mp3 audio format, one can satisfy his needs for a portable audio device thru the use of mp3 players.
Mp3 players became very popular and it is very common to see people using it while doing many activities such as jogging, commuting to work, traveling, buying groceries, computer related tasks and others.
For those who intend to purchase an mp3 player, one might consider the following tips:
1 - The internal memory size of an mp3 player will determine the amount of mp3 songs the device will be able to hold. Some models may even have an internal hard drive to store songs, however the size and price may go up a little bit and it is not recommend to be used by someone doing intensive physical activities. Also some models may the have the option of flash memory.
2 - The battery life is a very important feature, because it will determine how many hours the mp3 player will function properly. Make sure the mp3 player comes with an AC/DV adapter for quick battery charge.
3 - There a lots of sizes of mp3 players. Features such as a larger screen, video capability, hard drive and others, all add up to a bigger size. And price too!
4 - The way an mp3 player connects to a computer is a also very important feature. Latest model may support high speed USB 2.0 transfer. Some others may even have Firewire support.
5 - Some mp3 players even may accept other audio format besides mp3, such as WMA format. Check the player's specification if this feature is going to be used.
6 - Also mp3 players may have other features besides of mp3 playing. Features such as FM tuner and audio recording capability, may be of some interest to some users.
7 - As for the price just make sure the mp3 player you are buying has just the features you are looking for. Why pay more for features you are not going to be using anyway? Mp3 players can be purchased for prices from fifty up to several hundred dollars. Brand name players will cost even more.
Portable mp3 players have become a must have product of desire among the younger population. After all almost
26 January 2009
Choosing a Digital Camera - Clarity and Color
A digital camera produces excellent photographs. For many years however, professional photographers have discussed the drawbacks to the digital camera from the perspective of image quality which does not always match that available through a traditional 35mm film camera. The convenience afforded by going digital however far outweighs the minor loss in perceptible quality for most consumers.
For millions of potential camera shoppers, choosing the smallest, lightest camera is most important while others may wish to hold down costs or only share photos online where image quality is limited anyway. For these and other shoppers, finding and paying for a more costly camera may be unnecessary. But for those who strive to capture images that record the most accurate and color correct images, there are choices they can make during the shopping process that can help to assure they end up with equipment that will be capable of producing outstanding images.
The primary decision is not about megapixels; or at least not entirely. A digital camera with 10 megapixels does not necessarily produce a better image than a camera with only 6 megapixels. Megapixels are important and a camera must have enough of them to provide adequate image information for the size print being produced so that there is less noise and better clarity in the resulting image. Unless a consumer plans on producing very large images, 5 megapixels is generally sufficient and 3-4 may be enough if prints will be 5x7 or smaller.
The sensor which captures the light entering the camera lens is even more critical however. The sensor stores and displays data, converting the light into electrons. The sensor can be either CCD (charge-coupled device) or CMOS (complementary metal oxide semiconductor). CCD is the more mature technology and produces images with less noise. They also tend to be more expensive and consume more power but for those seeking the highest quality images, a CCD is the better choice at this time.
An important aspect of the CCD is the actual size of the sensor. Larger sensors provide higher resolution and less noise. Understanding how the size of the CCD sensor influences the quality of images and knowing what size sensor is adequate requires a bit more study. There are several articles available on line which could prove valuable for those wishing to learn more about this topic. Articles at www.photo.net/equipment/digital/sensorsize/ and www.photo.net/equipment/digital/basics/ are well written and knowledgeable.
A final consideration regarding the sensor in a digital camera is the availability of 1 CCD and 3 CCD models. As one might suspect more is often better. A camera with 1 CCD picks up image and color information through a single sensor. A model with 3 CCD has a sensor that picks up each of the different colors (Red, Green, and Blue) resulting in superior color reproduction.
Certainly the selection of a CCD sensor over a CMOS sensor, a larger sensor, or more sensors is not required in order to own a high quality digital camera capable of producing very good images. However, these features certainly do significantly enhance image quality and are the focus of attention for those seeking to produce the sharpest and most vivid images.
26 January 2009
Camcorders are ingenious tools that allow us to record images of the events that make up our lives or to get creative and produce unique and interesting films that previously only professional videographers could craft. For beginners, it is important to understand a little bit about the basic anatomy of a camcorder in order to be better equipped to make a selection when shopping.
Although every camcorder model is a bit different and may offer unique features there are basic components that are common to them all.
The Image Sensor:
A camcorder uses either a CCD, charge-coupled device, or CMOS, complimentary metal-oxide semiconductor, to convert light into electrical signals and record the resulting images. They basically perform the same function as film in a traditional camera or camcorder.
A CCD consumes much more power than a CMOS chip but tends to produce a higher quality image. Images produced via a camcorder with CMOS tend to have more "noise" due to lower resolution and less light sensitivity. As with most technologies however, CMOS as the newer development is gradually gaining ground. The primary advantage of CMOS at this time is it's affordability versus the more expensive CCD sensors.
The Lens:
The lens of a camcorder provides the opening for light to pass through onto the CCD/CMOS and focuses it so that the image is sharp. By adjusting the lens users can alter what items within a scene are in focus as well as how much light is entering to control the look and quality of the resulting images. Lens controllers are sometimes purchased to allow a user to adjust the lens from the handle of the tripod.
Add on lenses and filters can be used. For instance a telephoto lens allows subjects at a distance to be magnified, a wide angle lens broadens the horizontal field, and a fisheye lens allows for an extreme wide-angle view. Common filters include polarizing filters to reduce glare and UV filters to protect the lens from harmful rays.
An important feature with camcorder lenses is optical zoom which allows the lens to magnify images; a function that allows users to obtain better pictures of subjects at a distance. Optical image stabilizers help to detect and reduce unwanted movement of the camcorder to produce a smoother, more stable film. Digital versions of zoom and stabilization are available on camcorders but do tend to produce a somewhat lower quality image. Digital stabilization however is sometimes preferred by some consumers as camcorders with optical stabilization are often larger.
The Microphone:
The average camcorder has a built-in multi-directional microphone. These microphones tend to pick up audio from any direction; from behind, in front of, and at the sides of the camcorder. Thus many home movies end up difficult to hear due to undesired "background noise".
A camcorder also often has a microphone jack. If the camcorder has such a jack, purchasing an external microphone to attach to it can greatly improve the audio captured. External microphones can be moved closer to the sound source in some instances and in others they can focus on the sound that is desired versus any background noise. Wireless microphones and lapel microphones are useful when recording individual speakers. Shotgun microphones pick up sound from in front of the microphone at a distance while cardioid microphones pick up sound from in front which is nearby. Each option helps to reduce the intrusion of unwanted sound that distorts the audio desired.
The View Finder and LCD Panels:
The viewfinder on a camcorder allows users to see what they are filming. They can be black and white or color. Size varies as does resolution. Some users select a larger viewfinder with higher resolution to aid their visibility but others simply use the LCD screen for this purpose. LCD screen sizes vary as well, and are selected based on personal preference. Viewfinders can often provide greater visibility when filming in sunlight while use of an LCD screen that swivels allows greater visibility if filming overhead.
Inputs and Outputs:
A camcorder will have AV sockets and ports to allow connectivity to other devices such as a television or computer. These sockets allow film to be downloaded, played back, or copied. To allow the camcorder to hook up with a TV or other device it is important that the inputs and outputs coincide. These may be composite video or S-video for analog signals or DVI/HDMI for digital signals.
Most camcorders will hook up with a PC via a USB 2 or FireWire port which allows much faster transfer than a USB 1.1 port. Again, the camcorder must be compatible with the computer to allow hook up.
Although the construction of a camcorder can be much more complex and there is variability in features from device to device, if beginners understand these basic parts they will be well on their way to being able to make a knowledgeable selection when shopping.
