Digital Camera Exposure Explained

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digital camera exposure explained

Buying And Understanding High Speed Digital Cameras

In our high tech world we are used to having things done quickly; however, we don’t want quality to take a back seat to timeliness. Digital technology gives us incredible speed mixed with amazing performance. No where is this more evident than with digital cameras. High speed digital cameras are specifically designed for advanced professional and industrial usage. Thinking about buying a high speed digital camera? If so, let me explain this concept in more detail.

High speed digital cameras were designed to capture very fast images. These cameras are mainly used in industrial and scientific applications where a process of their function is moving or changing rapidly. These high speed digital cameras can take photos in both color and monochrome mode.

Monochrome photos are in either total black and white or a combination of both which will give you a grayscale photo. When taking color photos these cameras operate on the RGB method which generates a range of colors. RGB, or red, green, blue senses the red, green and blue components and then conjoins these components to form an extensive spectrum of colors.

A variety of unique features determine the performance of a high speed digital camera. These features are horizontal resolution, maximum frame rate and shutter speed. Horizontal resolution is the highest amount of individual photo elements which can be distinguished in one scanning line. This is an essential feature for characterizing correct horizontal video resolution for image aspect ratio. Horizontal resolution is also used to specify the resolution in the biggest circle which can fit in a rectangular image. For example, an 800×600 image would be specified as 600 horizontal lines.

Maximum frame rate refers to the maximum number of photos that can be taken in the specific time period. The time period is usually counted in seconds. Shutter speed refers to how much light will be let in during exposure. This can be set across a wide range, depending upon the subject and light conditions.

There are two basic types of high speed digital cameras. There are CCD and CMOS. CCD is short for charge coupled devices. The CCD is made up of a light sensitive silicon chip. As light hits the CCD the silicon chip begins converting the light into electrons. The chip then carries these electrons across the chip where they are read at one corner of the array. With the help of an analog-to-digital converter, the amount of electrons at each photo site is measured and then they are converted into the binary form.

CMOS refers to the complimentary metal oxide semiconductor. CMOS technology is also used to convert light into electrons. A CMOS uses a variety of transistors in every pixel to move and amplify the charge using traditional wires. The signals of CMOS don’t require conversion into digital form as they are already digital. The CMOS image sensors consume low power as they operate at lower voltages than the CCDs.

The most popular choices for digital output include Ethernet, RS232, DeviceNet, CANbus, USB, SCSI, modem and wireless. The usual choices for the number of mega pixels can vary from 8 bits to 16 bits. Even the color output can vary from composite, RGB or S-Video.

Some of the prominent physical features for the high speed digital cameras include radiation hardened, underwater rated, outdoor rated, gooseneck, board mount, pan or tilt and remote head.

Buying digital cameras can be a bit of a headache, but you will no doubt get a better deal buying online. Try putting the model you wish to purchase in the Google search box, and then you will see several online shopping possibilities. Check the prices, mailing charges and of course the guarantee you will have, in case the camera is faulty, and you need to return it.
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How to Take Digital Photos of Artwork?

I have an E-Volt 510 Digital Camera. I want to take pictures of approx 10″X18″ watercolors and pen and ink drawings on paper. I have a gray board and a white balance lens cap. I also have a tripod. I was told that in order to achieve the best results in terms of color accuracy and exposure it is best to take the pictures using the Manual setting. Can you explain to me in simple steps who to take these pictures assuming I am using natural light (outdoors)? My goal is to upload these pictures to the Internet with accurate and vivid colors including the white color of the paper. Thanks.

Take the images in the early morning,or mid to late afternoon. This will prevent the harsh, overpowering mid-day sun and allow you to set the images vertically. This will allow you to open your aperture as wide as you can, and keep the entire image within the depth of field. It will also allow you get even lighting across the paper. The other suggestion I have may sound odd. When using the tripod, use the camera’s timer to take the image. The act of pressing the shutter button will create very small vibrations and when looking for the best detail in an image can cause minute blurring. The timer will allow these movements to stop before snapping the image. Your white balance cap/gray board should allow your white balance settings to accurate enough to give you true colors.

Digital Photography 1 on 1: Episode 1

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