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The use of plastics in some SLR Camera Digital Lenses, allow the manufacture of highly aspherical lens elements which are almost impossible to create using glass. Plastics in SLR Camera Digital Lenses can improve lens manufacture process and the overall performance quality.  While plastic is often used on inner elements, they are only used on the outermost elements of all but the cheapest lenses as they scratch easily.

An indication of their utility is that molded plastic lenses are used in the manufacture of the cheapest throw-away disposable cameras. manufacturers of quality optics tend to use euphemisms such as “optical resin”.  While it is true that glass provides for higher quality performance than plastic in SLR Camera Digital Lenses, many modern and high performance lenses from big brand labels include some molded or hybrid aspherical elements.

Optical Zoom for SLR Camera Digital Lenses

Optical Zoom on SLR Camera Digital Lenses comprises of the physical adjustment of the lens components, thus focal length to achieve the desired close up on the object.  Unlike digital zoom, optical quality is not compromised when using optical zoom lenses on digital cameras.

Digital Zoom for SLR Camera Digital Lenses

Digital zoom is a method of decreasing (narrowing) the apparent angle of view of a digital photographic image. Digital zoom is accomplished by cropping the desired section of an image andusing same aspect ratio measurements as the original image.  The software either in the SLR Digital Camera of on the PC will interpolate the image to the pixel dimensions of the original image.   This however does result in a loss of image quality as you are essentially covering the gaps between the pixels.  By enlarging a smaller area the software makes a best guess of what those gaps should look like, which results in a loss of image sharpness and can sometimes even resultin blurred images.

Some digital cameras don’t have lenses (point and shoot) and rely entirely on digital zoom. A few SLR Digital Cameras with Zoom Lenses may also apply digital zoom automatically once its longest focal length has been reached.

Buying the right SLR Digital Camera made easy right here!  Most sites make it more difficult than it needs to be.

The main factors to consider first are listed below:

•    Cost – You should look to buy the best camera for the amount you are willing to spend, even if it means the SLR Digital Camera will have more features than you will initially require.  Given the speed with which technology is advancing, this will give your camera the maximum lifespan for its price point instead of being quickly superseded by the latest release.  Buying something a little more advanced than what you require, though still within your budget, will allow you to develop your skills further as you grow into using the full capabilities of the camera.

•    Megapixels – These are the little digital dots which make up a photograph.  The higher the number, the greater the detail, which means you can print out larger images and still maintain the quality of the image.  Taking highly detailed photographs will use up more memory too, so it is a balance between what you need and what is practical.  These days most SLR Digital Cameras have 10, 12 or even 14 megapixels.  If you’re positive you want to print at large sizes, then you need a camera with a lot of megapixels.   10 megapixels are more than enough to produce a high quality image for most enthusiasts.

If you have 10 megapixels, then the SLR Camera Digital Lenses you buy will make more of a difference to the quality of the photographs you will take thereafter.  Just remember that SLR Digital Cameras with high megapixels are much more expensive, consume more memory and battery power.  Do you really need any more than 10 perhaps even 12mp?  Most enthusiasts don’t.

•    Size – Some SLR Digital Camera bodies can be quite large, which makes carrying them around quite tiresome.  Then you have some SLR Camera Digital Lenses which can also be quite large.  It all adds up to quite a weight around your neck!  You will have to compromise with certain features and quality to buy a smaller SLR Digital Camera, which is why determining the main purpose for you camera is important.

•    Speed – If you are going to be taking photos of moving objects like sporting action shots, dance, racing etc then you will need a camera that is fast enough to accommodate this, otherwise your photographs will be blurred.

•    Ratings & Reviews - There are some fantastic online sources of consumer ratings and reviews by people who take photography very seriously.  Some blog reviews are highly professional and authoritative.  Google is your friend!

To match your SLR Digital Camera’s features to your style, use the chart below to identify the other requirements you should prioritise.  Entry level SLR Digital Cameras by the major manufacturers like Nikon and Canon will accommodate most of these to a degree as they are generally good all-round cameras, though higher specifications will require you to look to the top end range.

SLR Digital Cameras will accommodate more than just one style of photography, though some have certain advanced features that will suit one particular style over others.

SLR Digital Cameras at the same price point from the major manufacturers will offer more or less the same level of features and specifications, though some may have certain relative strengths, however small the differences.  Since they have different development timetables, Nikon may release their latest in advance of Canon; therefore offer a more advanced solution until Canon release their latest offering.

However, the most important objective is to find a camera that matches your primary photographic need first, and then assess how it measures up for the other styles of photography.  From there, it is a matter of buying the right SLR Camera Digital Lenses to suit your style of photography.

Some additional features to consider
•    Self-cleaning sensors
•    High Continuous Photo Speed (also called Burst Rate)
•    ISO range
•    Anti-shake/vibration
•    Live view - LCD screen
•    The Size and Weight
•    Extended dynamic range

Finding the right SLR Camera Digital Lenses made simple and easy!  Choose from the best range of SLR Camera Digital Lenses and Cameras from Nikon, Canon, Sigma, Tamron, Sony et al.  Below is a simple explanation of what to look for.

What Brand Is Your Digital SLR Camera?

Before we begin, which brand of digital SLR camera are you buying a lens for? If you haven’t already bought a camera, then click here to read more about purchasing a camera.

Lenses are not interchangeable between brands. For example, Nikon, Pentax, Sony lenses cannot be used on Canon SLR Cameras. Each brand uses its on unique technology and lense mount (where the lens connects to the camera body), though all working to the same principle.

Branded Camera Digital Lenses are more expensive and this may not suit your budget. However you can buy third party lenses that are significantly cheaper from makers like Sigma, Tamron etc but you must check that the lens mount is compatible with your Digital SLR Camera model.

Third party lenses are great value for money and provide excellent quality these days. However some advanced users find there is a slightly noticeable difference compared to the equivalent branded lenses. Often the difference can be due to minute compatibility issues rather than the actual quality of the lens’ construction. Most people will find this negligible and happy to pay 30-50% less for a third party lens.

Decide on a Lens

Follow this process and you will find yourself with 2-3 options to compare. Write down your options as you complete each step. It’s well worth it!

1. Decide on focal length:  What will you use the camera for?

You can buy some very flexible lenses with a very wide focal length range (more on the this below), but the above are the typical options available.

Do you want a prime lens or zoom lens

Zoom Lenses

Zoom lenses have an adjustable focal length range. Most ameras come with a standard 18-55 or 18-70mm lens.

Note: the bigger the difference between the two numbers indicates a more powerful lens and greater versatility in the type of shots you can take. This flexibility is great, especially when you are just starting out.

The focal length range of any zoom lens will have two numbers:

Wide angle: the smaller number

Telephoto: the larger number

Prime Lenses

Prime lenses have a fixed focal length. If you want to change the angle of view, then you will need to physically move the camera to accommodate or change the prime lens to a suitable focal length. These are often used by professionals because they take much clearer photographs. If your subject is in a fixed position and you want to spend some time capturing the perfect shot, then these are great. But if you are wandering about a new city or park etc then you will probably need to bring a range of lenses to accommodate the different subjects you will want to photograph. Not particularly convenient

3. Select the desired maximum aperture

The maximum aperture of the lens you choose can have a significant impact on the types of photos you can take with your digital SLR camera.

However, you have to make sure that you don’t get carried away and get a lens with a wider maximum aperture than you need.

Why? Because the wider the lens gets, the more it costs (and I’m not talking nickles and dimes here).

Since maximum aperture is directly related to aperture, let’s talk about that one first.

Aperture

The aperture is a hole that lets light in through the lens and into the camera. The size of this whole can be regulated by adjusting the aperture.

The standard scale for aperture numbers is as follows:

NOTE:

• Small Aperture Number (2.8) = More Light due to a bigger Aperture
• Larg Aperture Number (22) = Less light due to a smaller aperture.

It is the opposite of what you may have assumed.

This is what it graphically looks like (though not to scale!)

Most lenses today can be set to f/16, however not every lens can be set to f/1.4 (the largest aperture). The latter is called the maximum aperture.

A lens with a bigger maximum aperture can let more light in, therefore take better pictures indoors or under conditions of low light.

4. Choose between branded lenses or third party lenses

There are two options when it comes to lenses:

Branded: the same brand lens as the camera.

3^rd party: made by a company other than the brand of the camera body.

NOTE: Lenses from the major manufacturers are not compatible with each other’s camera bodies eg Nikon lenses can only be used on Nikon cameras.

Some 3^rd party lenses can be interchangeable between camera brands, but this depends entirely on the camera mount. Always check the compatibility of the camera mount when buying a 3^rd party lens. It can make for an expensive mistake.

The historical formula when it comes to choosing between branded and 3^rd party lenses was price v quality. 3^rd Party lenses have long been considered to be of lesser and even poor quality.

This quality gap has now been closed by Tamron and Sigma, two of the biggest 3^rd party lens makers. Their lenses offer excellent quality with barely discernable differences for the purposes of most enthusiasts.

Compatibility issues may still arise with 3^rd party lenses and professionals still have a strong preference for branded lenses because of the continued quality superiority.

For most enthusiasts, 3^rd party lenses are more than adequate and well worth considering, though you will need to buy a Nikon or Canon camera as 3^rd party manufacturers tend to make lenses for these companies more so than the others.

If you are still having difficulty deciding and you are just starting out, go with the 3^rd party lens until you confirm your enthusiasm for photography. If it just the occasional outing, then they will do you just fine. If you find you want to take things more seriously, then you haven’t lost anything through buying a pretty good quality lens.

5. Read lots and lots of online reviews: Google your options and read reviews. There are some very good blog reviews and user recommendations online. Just type in the “lens model + review”