BenQ DC C800 Digital Camera
November 13, 2007
BenQ DC C800 Digital Camera is an attractive and eye catchy device, wanted by every generation to capture their lovely times into images as sweet memories. BenQ a well known company in the UK introduces this compact and cute digital camera. It comes with a lot of advanced features to produce images with clarity.
Display screen
A standard point and shoot digital camera, the new BenQ DC C800 is provided with an LCD TFT screen. The screen size is 2.4 inches. In this screen you can get the details bout the state of the battery, date/time stamp, number of shots taken, etc.
BenQ’s digital camera is available with 8 mega-pixels. The CCD type image sensor is used in this unit. CCD stands for ‘Charged Couple Device’. It has optical zoom of 3x and digital zoom of 4x. These optical and digital zoom features is used for enlarging the image. It has auto-focus feature to focus the distance between the object and the photographer.
Video Format
The digital camera also has the ability to take videos. Its video speed is 30 frames per second. The format that this digital camera accepts is MPEG-4 video format.
Aperture
Aperture is a tiny opening which allows the light to enter in. Its range is f 5.1 (w) to f 2.8 (w). The shutter speed available in this unit is 8-1/2000 seconds.
White Balance
To adjust the white balance in the image, the unit has types of white balance such as auto, manual and presets. Preset white balance modes are available in types like daylight/ sunny, cloudy, fluorescent and incandescent.
Memory Feature
BenQ DC C800 Digital Camera is supported with SD Card flash memory. This flash card can be removed or replaced when ever you capture picture. This SD Memory Card can store maximum number of pictures. The unit has a built-in memory which has the storage capacity up to 32 MB.
Flash Modes
An integrated flash is available in this digital camera and the flash modes are flash off, auto flash, fill-in flash and slow sync.
Interfaces available
It has USB 2.0 and USB type interfaces to connect the unit. A video out interface for video feature is also present in the device.
Included Features
BenQ DC C800 Digital Camera includes feature like self timer for 2 seconds and 10 seconds. Built-in speaker is provided in this device. It runs with the support of two AA type batteries. The other features supported by the device include printer mode, Burst mode, video speed, aperture range, white balance, etc.
Dimensions
Its height x width x depth is 6cm x 8.9 cm x 3.3cm. As the unit is portable, it just weighs about 0.14 kilo grams.
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Inside digital cameras : RGB and CYMG colour filters
November 13, 2007
There are two types of colour filters used in digital photography. They are RGB and CYMG referring to number of coloured filters used in each method. In RGB type colour filter, filters of three primary colours are used – Red, Green and Blue with half of the colour elements are green as the human eye is more sensitive to this colour. In CYMG type colour filter, cyan, magenta, yellow and black filters are used and type of filter is used mostly in colour printers and a few digital cameras.
RGB Filter
RGB uses primary or additive colours (red, green and blue) and mix them in different amounts to produce various colours. When these colours are added in exactly equal amount, the result is you will see white colour. When there is no light hitting on the photosites, you get black. In this method, red and green filters sit over the pixels (photosites) on the sensor arranged one after another. The next row of pixels is covered by similarly arranged array of green and blue filters and so on. This is how the filters are arranged in a Bayer filter or in display devices like televisions and computer monitors. Recently, improved RGB patters are used in digital cameras to produce better results.
CYMG Filter
CNMG colour filter uses four colours - cyan, magenta, yellow and black to capture the colour information of the image. In this method, colours are produced using reflective and subtractive technique and this type of filters use slightly light colour tones when compared with RGB. Since, they use lighter colour tones, they allow much more light to fall on pixels of the sensor and work well with sensors that are prone to noise during capturing of the image.
Digital Camera basics - Part 2: Image Sensors
November 12, 2007
A conventional camera and a digital camera differ in the way they capture and store an image. The earlier cameras (even now they are not completely replaced by digital cameras) use film to capture the images while a digital camera uses an image sensor instead. The image sensor is made up of millions of pixels which are photosensitive and covert the light that falls on them into electrically charged particles, i.e. electrons. In other words, the resolution of a digital camera is the number of pixels or tiny photosensitive spots present the sensor. For instance, a 5 mega pixel digital camera will have a sensor having 5 million pixels.
CCD sensors and CMOS sensors
Digital cameras use two types of image sensors to capture the images - charge-coupled devices (CCD) and Complimentary Metal Oxide Semi-conductor devices (CMOS). Both the sensors have photodiodes or photosites which capture the light and convert it into electrically charged particles (electrons). Both the technologies produce excellent pixels quality, however, they differ from each other in terms of processing the image and the hardware aspects.
CCD sensors (Charge-Coupled Devices)
Being the older of the two technologies and long been used in various digital cameras like camcorders, compact digital cameras, scanners and astronomical telescopes, CCD is considered better suited to capturing of images in digital cameras and most digital cameras use this technology. Since CCD has passed through various advancements during its evolution, it is capable of producing better resolution of an image as it has large number of pixels that can produce much more picture details than its counterpart.
A CCD sensor, when it is exposed to light, its pixels get charged with different magnitudes depending upon the intensities of the light that strike each pixel. The register in the sensor reads the charge of the pixels row by row. The pixel values are fed into an analog-to-digital converter which convert them into digital format (in 1s and 2s strings). This is done for each and every row of pixels on the surface of the CCD chip.
CMOS Sensors (Complimentary Metal Oxide Semi-conductor devices)
CMOS sensor has been recently used in digital cameras for a few advantages like lower cost of production and less consumption of power. They are made up of small circuits and other devices like transistors knitted together on a silicon chips. Since CMOS chips are used in PCs as processors and memory chips, they are generally produced in large scale resulting in lower cost of production, thus cutting the price of digital cameras when they are used instead of CCD sensors. Another significant advantage that a CMOS sensor has over CCD sensor is that it consumes less power, just one-hundredth of what a similar sized CCD chip will consume. On the negative side, CMOS sensors generally produce lesser pixels quality in comparison with CCD sensor as their photo sensitivity is much lower than CCD sensors. This is because the light strikes the network of transistors arranged near the pixels (photodiodes). CMOS sensors also produce noisy pictures as the processing circuits are present on the same chip.
Major Differences between CCD Sensors and CMOS sensors
- CCD sensors are well known for their superior pixels quality. They are highly photo sensitive. In comparison, CMOS sensors are less sensitve to the light and produce slighltly inferior picture quality.
- CCD sensors need a separate amplifier and Analog to Digital Converter (ADC) to process the image while CMOS sensors come with integrated transistors which amplfy the charges and hence do not need ADC.
- CCD sensors generally do not produce noisy image processing while CMOS sensor are quite prone to noisy pictures.
- CMOS sensors are less expensive and consume much less power. However, a CCD usually costs much higher and consumer many times the power a similar sized CMOS sensor consumes.
In spite of these differences, both CCD and CMOS sensors are being used by the leading digital camera makers. Despite their advantages and disadvantages, both produce excellent picture quality.
Kodak EasyShare C875 Digital Camera Review
November 12, 2007
A slim and compactly designed Kodak EasyShare C875 digital camera is introduced by a well popular company called Kodak. You can expect good and effective colour pictures. It has Multi-Media Card and SD Memory Card support for Flash Memory.
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- Kodak’s unique device has its dimensions with width x height x depth are 9.1 cm x 3.7 cm x 6.3 cm.
- The unit is a light weight product that just weighs about 177 grams.
- It comes with an LCD display screen which is sized about 2.5 inches. The image in this digital camera supports colour display.
- Quick-Time (MPEG-4) format can be accepted by the digital video of the product.
- CCD its abbreviation of charged-couple device and it is the optical sensor is used in the unit.
- It has the resolution of 8.0 mega pixels.
- List of shooting modes in Kodak EasyShare C875 digital camera are the followings:
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- Landscape
- Portrait mode
- Close-up
- Party/indoor
- Back-light
- Night portrait
- Self-portrait
- Sports mode.
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- Black & white and Sepia are the special effects of the product.
- JPEG format supports still image format in the unit.
- It has automatic and presets white balance modes.
- Your handy device is integrated with memory which has the capability store up to 32 MB.
- Flash memory that supports the unit is Multi-Media-Card and SD Memory Card.
- The compact and portable device is available with built-in microphone.
- Lens system has built-in lens shield and aspherical lens.
- Lens system has auto focus feature with TTL contrast detection. Automatic and manual focus adjustments are available in this unit.
- The Kodak EasyShare C875 digital camera has two type of zoom feature such as optical zoom 5x and digital zoom 5x.
- Your compact designed unit has ’self timer delay’ feature which can delay to take shots up to 10 seconds and 2 seconds.
- It has built-in flash feature with effective range of 0.6 m to 4.1 metre. The camera flash comes with AF illuminator.
- Flash modes available in this unit are fill-in mode, auto mode, flash off mode, red eye reduction.
- Connectors available in this cute device are one USB, one composite video/ audio output and one docking station.
- Expansion slot has one SD Memory Card.
- Additional features provided in your unique Kodak EasyShare C875 digital camera are USB 2.0 Compatibility, auto power saver, date/time stamp, DPOF support, Pict-Bridge Support, audio recording, direct print.
Some related camera review links
- Camera reviews on Kodak DC3200
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HP PhotoSmart R827 Digital Camera
November 10, 2007
HP is a tremendous manufacturer of electronic devices and digital cameras. HP has introduced an ultra-compact Photo-Smart R827 Digital Camera which can take stunning photos, with resolution of 7.2 mega-pixels. It runs with the support of one lithium-ion rechargeable battery.
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- Photo-Smart R827 Digital Camera manufactured by HP can produce pictures resolution of with 7.2 mega-pixels.
- It has 8x digital zoom feature and 3x optical zoom feature. This supports to enlarge the images.
- Its ’shooting modes’ are frame movie mode, panorama assist and anti-shake mode.
- This cute metal body camera has programme and automatic exposure modes.
- JPEG supports the still image format and it has a built-in microphone.
- This unit has video capture feature with the resolution horizontally and vertically and it is 640 x 480 pixels. It takes 24 frames per second.
- The user can use ‘flash memory’ to store more pictures. The type of flash memory card used here is SD Memory Card.
- It has built-in flash facility to produce light while taking shots.
- ‘Zoom lens’ is provided in this digital camera with automatic focus adjustment. Motorized drive is used for zoom adjustment. Its ‘auto focus’ feature makes the unit to adjust focal length through the lens contrast detection.
- ‘LCD TFT active matrix’ based technology is used to display the images with excellent quality. Its size is 2.5”, you can get coloured LCD display screen.
- One USB connection and one docking station are used as a type of connectors in this digital camera. Expansion slot is provided for one SD Memory Card.
- This unit has come with advanced additional feature which such as audio recording, direct print, Pict-Bridge support, in-camera red-eye removal and adaptive lighting.
- A lightweight handy and portable device carried anywhere you desire weighs just 140 grams.
- Width x depth x height are measured as 9.3 cm x 2.4 cm x 6.1 cm.
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