IMAGE QUALITY IN DSLR CAMERAS

There are a number of factors that will have an effect on image quality in DSLR cameras. Some factors can be controlled by the photographer, including exposure, ISO and lens selection. Others are specific to the camera being used, such as sensor size and processors.

ISO & Noise

• ISO is the camera's sensitivity to light. In bright settings a low ISO number (100-200) is typically used. In low light the camera requires a longer shutter speed, or increased aperture size, allowing more light to hit the sensor. However, some pictures may require a fast shutter speed photos of indoor sports, for example. In those cases the photographer can increase the camera's ISO setting to compensate for the low light. A higher ISO results in the creation of digital noise, those blue, pink and purple specks that appear in pictures generally viewed as an undesirable by-product.

Lens Quality

• Whether you are using a film camera or digital camera, the lens you select will affect image quality as well. Long before light from your picture appears on the digital sensor, it has to travel through a number of glass or plastic elements inside the lens. Using cheaper lenses can result in a permanent effect on the quality of your photos. Cheaper lenses may result in poor autofocus or have chromatic aberrations a purple fringing in your photos. They may also have difficulty with maintaining perspective on walls.

Exposure

• Exposure is another factor that will affect the image quality in DSLR cameras. Exposure is the amount of light that travels through the lens to the digital sensor. The amount of light is controlled in two ways, shutter speed and aperture. The shutter speed determines how long the shutter stays open, allowing light to hit the sensor. The lens aperture is the size of the opening that light travels through, from small to large. If you have a slow shutter speed then you need a larger opening, and vice versa. While many cameras have sophisticated auto-exposure programs, under certain conditions those programs will not always provide the correct setting. If an image is under- or over-exposed too much, the picture will not be usable.

  
  

  
  

  This is Output from DSLR Cameras

  
  

  
  

  
  

  

  
  

  Image Focus on subject 

  
  

  

  
  

  
  

Sharpen Of the Image ~ 

DIFFERENT BETWEEN DIGITAL CAMERA AND DSLR

Well the major difference between a digital cams and DSLRs is in the way of viewing the picture or the scene. 
Digital cams use LCD or an Electronic Viewfinder while the DSLR or the so called Digital Single Lens Reflex have the optical viewfinders, this means it consist of a return mirror and a pentaprism.

Another difference between the two includes the chip size, Most DSLRs use an imaging.
There are DSLRs with 6 Megapixel chips, and the digital cams with 8 Megapixel, as far as I know, Megapixel are only part of the image quality, and frequently not important. The Size and weight between the two are also different.

DSLR are excellent in image quality at low ISO level, lower noise at a high ISO level, have a wide range of exchangeable lenses, the availability of Image lenses, much brighter and clearer viewfinder compared to the digital cams. DSLR have a high frames rates even if you are in a RAW mode settings and allowing rapid shooting without freezing.

Digital Cameras are smaller and lighter weight. The zoom lens is included depending on the price. No shutter and mirror noise. Macro shooting accessibility without other lenses depending on the model; Tilting and revolving the LCDs are allow for framing purposes at short angles. Depth of field at any given image exaggeration and the switching between LCD and EVF (Electronic Viewer Finder) is slow.

Size and Weight

Anyone who wants a camera that fits in their pocket can forget all about digital SLRs.

Size and weight is the second most obvious difference between SLR and compact digital cameras after price. Even a small-sized digital SLR camera is twice the size and bulk of a compact camera.

While there are many new digital SLR models that are more portable (and are easier to travel with) the addition of a lens to your camera ensures that you'll never be able to stow it away in your shirt pocket or purse.

So What Should You Buy?

Even though I've talked about the difference between SLR and digital compact cameras you still might be on the fence.

Here are a few questions that might help you make up your mind:

• Do you want to take more professional-looking photos?
• Do you want to create high-definition home movies?
• Do you want to be able to change the lens attached to your camera?
• Do you want more control over the photos that you take?
• Are you sick and tired of the slow speed of your compact camera?
• Do you want to take lots of photos in dim light?

If your answered YES to every question, get a digital SLR. You'll be happier in the long run.

If your answered NO to every question, so u might be cHoose Digital Compact :D .

ADVANTAGES & DISADVANTAGES OF DIGITAL PHOTOGRAPHY

The Advantages Of Shooting Digitally

1) Immediate gratification:

When you have a chance to make a very important photograph, there is no denying the fact that being able to instantly look at a histogram, verify your exposure, double check your composition, etc., is very rewarding and reassuring.

2) You have the ability to immediately deliver the image to client:

Clients LOVE being able to get their images quickly. In the wedding and portrait business or the advertising world, there are few more powerful phrases than; "You can have the picture today."

3) Instant ISO/white balance change from shot-to-shot:

In the film days, I would think nothing of rewinding a roll of Velvia if it got too dark to shoot at ISO 50. I would just move to Provia 100 and waste the rest of the roll. Changing film like that is not only expensive, it is time consuming. With my digital camera, I hit a button and can change the ISO from 100 to 3200 on a shot-by-shot basis. I also don't have to worry about adjusting (adding filters) for indoor/outdoor lighting since I can change the white balance with the click of a switch.

The Disadvantages Of Shooting Digitally

1) Higher initial cost:

There is no denying the fact that digital has a higher initial cost. A flagship film body will usually cost 50 to 75% less than its digital counterpart.

2) Digital cameras are not equal to film cameras in features:

My Canon EOS 3 has a faster frame rate and better auto-focus than my 20D. While the difference in features between the two is narrowing fast, I would have to give a slight edge to film cameras in this department.

3) Perception problems:

This is another area that is quickly changing but there are some who still think that digital photography is somehow less valuable than film photography. Reasonable or not, it is a stumbling block for some people.

4) Poor low-light performance:

Every digital camera I have used performs poorly (when compared to film) in low light. Everything from poor auto focus to noisy images can be a problem with digital photography. There are ways to work around these problems and they are quickly becoming non-issues, but they are real for now and should be considered.

Conclusion

Whether or not you switch to digital photography, digital is and will remain a force in the photo universe. If you are interested in digital, rent or borrow a digital camera to get the feel of it. Spend some time with a friend who shoots digitally and see how they handle their digital workflow. In time, I think that digital photography will be the norm and that film will fall far behind. Whether or not you agree, it only makes sense to investigate digital as an alternative medium. Then you can decide for yourself if it is time to switch.