Some of the advantages of dSLRs are more closely related to the digital single lens reflex design.

• Better lenses. You might argue that a non-dSLR eliminates the need for interchangeable lenses. If your 12X zoom EVF camera offers all the focal length equivalents between 28mm and 336mm, who in their right mind (other than architectural photographers at the wide end, and pro sports photographers at the tele end) would need more? However, I maintain that even if you super glue your lens to a dSLR (transforming it into a noninterchangeable lens camera), the dSLR’s zoom lens will provide better, sharper pictures than what you can expect from a non-dSLR’s optics.There’s plenty of room for argument here, but, in general, it’s easier to design a high quality lens for an SLR’s larger sensor than it is for a tiny point-and-shoot’s CCD.
• Easier upgrading. Conversely, you don’t have to load down your camera with features you don’t need. As I write this, only a few non-dSLRs offer image stabilization (which minimizes blur caused by camera movement at low shutter speeds). If you want that feature in a non-dSLR, you have to specifically purchase a camera that offers it. (At the time I’m writing this, the Konica Minolta 7D is the only dSLR with anti-shake technology built into the camera body itself.) A more powerful external flash is an easy addition, too, compared with point-and-shoot digital cameras, many of which allow no external flash at all (other than slaved units).
• Better use of power. You’ll find that your dSLR camera’s battery will last much longer than you expect. Most digital SLRs switch off their autofocus and autoexposure systems automatically if you haven’t used them for a few seconds, and the power-hungry LCD is on only during picture review or menu navigation. You can leave a dSLR switched on for days on end without depleting your batteries. A non-dSLR with an optical viewfinder is guaranteed to chop off heads, or worse, as you compose your pictures.
• True “what you see is what you get” composition. A non-dSLR with an optical viewfinder is guaranteed to chop off heads, or worse, as you compose your pictures. The LCD on the back of the camera provides a reasonable facsimile of what the sensor sees, except you can’t see it in bright light, and the details on an LCD that can be as small as 1.5 inches are too small anyway.

Digital cameras use a sensor known as CCD in order to convert light energy to pixels. Dust that accumulates on the CCD can result in black pixels or imperfections in the photo as it blocks light energy from hitting parts of the CCD. We will go over a few solutions for eliminating dust on the CCD.

The CCD sensor is located behind the reflex mirror in a digital SLR camera. Most of the time the camera is closed and dust can not penetrate it. Some cameras might not be completely sealed against dust resulting in dust penetrating he camera’s body even with the lenses installed. During that time the camera is open and exposed to air and dust.

In order to minimize dust on the CCD make sure that you minimize the time in which the camera is open and exposed to air. Even with careful care dust will eventually find its way into the camera and on the CCD.

Active dust removal: Most new SLR cameras include some sort of active dust removal mechanism. The most common one is anti dust vibration. Vibrating the CCD will result in dust falling off the CCD or “dancing its way” from the CCD. Different cameras turn the anti dust vibration at different times. Other cameras turn the vibration on periodically or let the user turn it manually.

Passive dust prevention: Passive solution that tries to eliminate some of the causes for dust accumulating on the CCD. The main reason that draws dust to the CCD is static charge.

Manual dust removal: Manual removal is simply a way for you to manually clean the CCD. All dust removal methods have their limitations. Adhesive dust or other material is either very hard to clean or impossible to clean. Eliminating dust completely from the CCD is impossible but by applying care and the mentioned features most of the dust that results in photo imperfections can be avoided.

During 1960’s, a campaign slogan for Pentax spoke “just hold a Pentax”. Some of the latest digital cameras from Pentax are the Pentax K200D, Pentax K20D, Pentax Optio W60, Pentax K10D.

The Pentax K20D digital SLR model follows the footsteps of the company’s successful K10D model. The K20D camera is a newly manufactured 14.6-megapixel with CMOS sensor. The Pentax K20D continues to provide both; the dust-reduction policies used in the K10D as well as K100D cameras like vibration of the sensor which will remove the dust particles.

Pentax K20D 14.6MP Digital SLR Camera with Shake Reduction (Body Only)

The PENTAX K20D digital SLR offers advanced photo enthusiasts an array of exciting PENTAX innovations. The newly developed CMOS image sensor brings out optimum performance of PENTAX interchangeable lenses. Featuring 14.6 effective megapixels (highest in its class) and the latest noise-reduction technology, the sensor assures superb image quality. Customizable features ideal for shooters who demand complete control include the Expanded Dynamic Range function that allows users to gain more contrast/detail in bright settings and a new Custom Image function to select/adjust finishing touches to an image. Improving on the technology of the award winning K10D, the flagship Pentax K20D is the highest-resolution camera in the advanced photo enthusiast category and allows more experienced photographers, who demand complete control, to fully customize the camera. Featuring 14.6 effective megapixels and the latest noise-reduction technology, the sensor assures superb image quality.

Custom Image functions that allow users to select between six preset options and further adjust image processing, including saturation, hue, contrast and sharpness. An improved Dust Reduction system that features the new Dust Alert function to pinpoint the exact location of dust particles for the photographer to remove.

A weather and dust-resistant body that allow photographers to keep shooting even in harsh conditions.