Features of digital cameras

A digital camera (or digicam for short) is a camera that takes video or still photographs, or both, digitally by recording images via an electronic image sensor.
Front and back of a Canon PowerShot A95.

Many compact digital still cameras can record sound and moving video as well as still photographs. In the Western market, digital cameras outsell their 35 mm film counterparts.

Digital cameras can do things film cameras cannot: displaying images on a screen immediately after they are recorded, storing thousands of images on a single small memory device, recording video with sound, and deleting images to free storage space. Some can crop pictures and perform other elementary image editing. Fundamentally they operate in the same manner as film cameras, typically using a lens with a variable diaphragm to focus light onto an image pickup device. The combination of the diaphragm and a shutter mechanism is used to admit the correct amount of light to the imager, just as with film; the only difference is that the image pickup device is electronic rather than chemical.

Digital cameras are incorporated into many devices ranging from PDAs and mobile phones (called camera phones) to vehicles. The Hubble Space Telescope and other astronomical devices are essentially specialised digital cameras.
Wednesday, October 28, 2009
Samsung SL620
Samsung SL620

The SL620 has everything you need in one compact camera. 12.2 megapixels give you the power to capture memories with beautiful details. And with a 5x optical zoom, it’s easy to get close to your subjects. Worried that photos might be less than perfect? The SL620 includes the SAMSUNG perfect portrait system which automatically retouches facial imperfections, selects the right scene mode and more. Make every shot a beauty, with the SL620 digital camera.

Specifications
Image sensor

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Type
1/2.33" (approx. 1.09 cm) CCD
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Effective Pixel
approx. 12.2 megapixel
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Total Pixel
approx. 12.4 megapixel

Focusing

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Type
TTL auto focus (multi AF, center AF)
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Modes
normal: 80 cm ~ infinity macro: 10 cm ~ 80 cm (wide), 50 cm ~ 80 cm (tele) auto macro: 10 cm ~ infinity (wide), 50 cm ~ infinity (tele)

Shutter

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Speed
auto: 1 ~ 1/2,000 s (AEB, continuous 1/4 ~ 1/2,000 s) night: 16 ~ 1/2,000 s

Exposure

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Compensation
± 2 EV (1/3 EV steps)
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ISO Equivalent
auto, 80, 100, 200, 400, 800, 1600, 3200 (up to 3 M)
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Metering System
multi, spot, center-weighted AE

Flash

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Recharging Time
approx. 4 s, (approx. 5 s in low battery condition)