what is D-slr ...???

SLR Defined

SLR is an abbreviation: it stands for Single Lens Reflex.

Now you know what SLR stands for but that doesn't really help answer the question, does it? Let's define further:

• With an SLR camera, you see exactly what the lens sees
• You can change the lens on a digital SLR
• Digital SLRs have large image sensors that produce high-quality photos
• An SLR has a near-zero lag time, and is ideal for action photography

Bottom line? Digital SLR cameras are versatile.

You can take photos of everything from sleeping kittens to race cars and you'll never be limited by your camera.

With an SLR in your hands you can rest assured that you'll only miss great photo opportunities because you weren't prepared, not because your camera wasn't able to get the shot.

The Anatomy of a Digital SLR

To properly answer "what is a digital SLR?" you have to understand a bit about the mechanics of an SLR camera.

In order to avoid getting overly technical I've simplified this diagram and am highlighting the key elements. Those interested in the minute details can read about Single-lens reflex cameras on Wikipedia.

1. Light passes through the lens and strikes a mirror (green)
2. The mirror reflects the light up to a focusing screen
3. Light passes through the focusing screen and enters a block of glass called a pentaprism (orange)
4. The pentaprism reflects the image so that you can see it in the viewfinder
5. When you take a photo, the mirror flips up and a shutter (blue) opens that exposes the digital sensor (red) to light

This is a great example of what-you-see-is-what-you-get. By using the viewfinder you can precisely compose your image and adjust the focus.

Is the image that you see in the viewfinder 100% accurate? In most cases it isn't. If you read digital SLR camera reviews, you may hear a lot about viewfinder "coverage" and "brightness".

Many digital SLR viewfinders only show you 95% of the image that will be captured by the sensor - this is what "coverage" refers to. Unless you are extremely precise when it comes to your photographs you won't notice the 5% difference.

Digital SLR viewfinders also vary in brightness, which is another way of saying how clear the image appears. "Bright" viewfinders make it easier to use manual focus, since you can clearly see the details of your subject.