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How Digital Cameras Work

A digital camera focuses light through a lens onto a sensor, that records images electronically. This electronic information is then converted into binary digital data, and stored on a fixed or a removable device for being read by a computer. Below is a more outlined way of understanding how digital cameras work.

1. The CCD

In practice, most digital cameras use a charge coupled device (CCD) as an image sensor. Some digital cameras use a complimentary metal oxide semiconductor (CMOS) instead. Both these sensors convert light into electrical charges, that are transferred to a storage disc. The sensors also filter the light into the three primary colors and then combine them to create the full spectrum. The more expensive cameras use three sensors. Each of them has a filter of a different color.

2. Light Control

Aperture and shutter speed is used to control the amount of light that reaches the sensor. The aperture setting is automatic in most digital cameras. Some cameras also allow manual control, for professionals and enthusiasts. The shutter, in contrast, is set electronically.

3. Lenses

The digital cameras use four kinds of lenses. These are: fixed-focus, fixed-zoom lenses; optical-zoom lenses with automatic focus; digital-zoom lenses, and replaceable lens systems. The fixed focus and fixed zoom lenses are used in inexpensive cameras while the optical zoom lenses have both wide and telephoto options. The digital zoom lens culls pixels from the central part of the image and enlarges them to fill the frame. Of course, this can at times result in a grainy or fuzzy image.

4. LCD Screen

This is the screen where you view the image. For better viewing or printing, the image needs to be transferred to a computer. The quality of the image depends on the resolution of a digital camera, and is measured in megapixels. The higher the resolution, the better is the image quality.

5. Resolution

The resolution is also important in deciding the size of printed photographs. A 1 megapixel digital camera will produce images that are good for e-mailing or posting on the Web. This is because their resolution is low. The images taken from a 2 megapixel camera are suitable for 4x5 inch prints while those taken from a 4 megapixel camera can produce 16x20 inch prints.

6. Memory

Most digital cameras store images within the camera on memory cards. These were then transferred with the help of cables to computers. Today, most digital camera makers provide reusable and removable storage devices. These include SmartMedia cards, CompactFlash cards and Memory Sticks. Some other removable storage devices include: floppy disks, hard disks, or microdrives, writeable CDs and DVDs. The vast volume of memory has increased as the technology increased, and exciting prospect.

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security cameras wireless Products we recommend
EVA Nylon Slim Size Digital Camera 4.2" x 3.1" x 1.3" Carrying Case for Hewlett Packard HP Photosmart - Bundled With Universal LCD Screen Protector Kit

EVA Nylon Slim Size Digital Camera 4.2" x 3.1" x 1.3" Carrying Case for Hewlett Packard HP Photosmart - Bundled With Universal LCD Screen Protector Kit
Compatible with Hewlett Packard HP Photosmart M425 M437 M537 R837 R927 R967

Airfrom Ultra Slim Mini Digital Camera Case with Detachable Carabiner and LCD Screen Protector for NIKON Nikon Coolpix Camera - See Description for Full Compatibility

Airfrom Ultra Slim Mini Digital Camera Case with Detachable Carabiner and LCD Screen Protector for NIKON Nikon Coolpix Camera - See Description for Full Compatibility
PCMicroStore Branded Non-OEM Case. 1 Year Unconditional Warranty if purchased through PCMicroStore. (Compatible with Nikon Coolpix L10, L11, L12, S200, S50, S50c, S500, 3700, L2, L3, L4, L6, P3, P4, S1, S2 S3, S5, S6 S7 S7c, S8 and S9)

Celestron Heavy-Duty Altazimuth Tripod

Celestron Heavy-Duty Altazimuth Tripod
Celestron wants to be known as a company that puts quality first in all aspects of its business. It is a complete company, working to make the best possible products backed up by the best possible product support. Because of this commitment to quality, Celestron organized its efforts to manufacture products from the inside out - starting with the most important internal components to the external touches that set the look of products apart. Celestron's overall mission is to provide the highest quality products at a competitive price.PRODUCT FEATURES:Extendable aluminum tripod legs with heavy duty mount head;Sliding ?"-20 mounting screw;Flexible slow motion cables for both altitude and azimuth;Max extended height - 45 inches;Folded height - 32 inches.This product is designed for the following systems:SkyMaster 20x80 and 25x100 binoculars;Ultima 80 and 100 Spotting scopes;C90 and C130 Mak Spotting scopes;C5 Spotting scope.For a complete compatibility list please refer to the original manufacturer's web site.

Customer Review: Wish I shopped around before buying

I'm not satisfied with this prduct. I bought it on trusting the Celestron product team. I wanted it to work well with the SkyMaster 25x100 bino. The parts and construction of the tripod have too many cheap metal and cheap plastic parts for cost of the product. I question how reliable and long lasting the core worm drives will be. As noted by other buyers the legs are too short and there seems to be no easy way to get around this with a table, etc. I now wonder if Amazon would buy it back? Also how will I find a suitable triod with having to buy it first? Amazon sold this to me for $99, now less than one month later the price is $35. $35 is more appropriate but possibly not worth the annoyances.

Customer Review: Tripod

I have been very disappointed with this product. The overall height is wrong for any situation I can find to use it. I bought it to use with astronomy binoculars. It is too short to use standing and too tall to use sitting, at least for me. (I'm 5'9"). It is solid enough to not shake much and the fine adjustment works well. I would shop around before buying this one. If there were a height adjustment, it would be much better.

Digital Purple 630 Disney Pix Click Tinkerbell Digital Camera

Digital Purple 630 Disney Pix Click Tinkerbell Digital Camera
Aspiring photographers can record favorite moments in a snap with their very own digital camera. Each one features a cool Disney theme that allows kids to add that particular character on their photos for a special effect. Includes 16MB memory, USB cable and interactive effects software for adding flair to photos. Holds up to 200 pictures. Requires 2 "AA" batteries (not included). 1.1" color LCD view screenMeasures 4.5" x 1.75" x 2.5".

Customer Review: Another piece of Disney "Cars" garbage

My mom got this for my 5 year-old for his birthday. The main interest was that it is a camera, and of course it was a nice bonus that it had the "Cars" theme. It is absolute junk. We're currently looking to see if there are any other kid-friendly cameras that will take a half-way decent picture in a similar price-range. You'd be better off just bying a toy camera, at least there is no expectation that you'd get a picture you could make out. If you'd like to get your child another "Cars" toy, just get him/her a toy car. So far, I'd say those are the only "Cars" toys we have that are well made (assuming of course they don't have lead paint).

Customer Review: cute camera and editing program

this is a really tiny camera. perfect for small hands. it comes with the software system called disney pics. its a really cool program once you figure it out. it was a little complicated even for us adults, and came with no instructions. the kids who are small enough to use the camera won't be able to use the software system. plus, its a digital camera, but you can't view your pictures after you take them. i just assumed with a digital camera that you could view the pictures as you take them, but not with this camera. the camera does take good pictures, esp for something so small. and the editing program is good for other purposes. we've used it to make invitations. so for the price, its an ok gift. i just wish you could view the pics as you take them.

Headlines on security cameras wireless
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Security camera project on hold; rebid planned - Schenectady Gazette

Thu, 21 Aug 2008 07:19:04 GMT

Security camera project on hold; rebid planned Schenectady Gazette, NY - Aug 21, 2008 Hugo said there are a lot of factors to think about, including whether to go with a wireless system over a wired one, where to put the cameras and what type ...

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