Zoom lenses bring you closer to the subject and should be chosen carefully
Choosing a zoom lens for your camera is almost as important as choosing the camera itself. The proper zoom lens will allow you to photograph your subject from a distance, ensuring that your subject remains undisturbed by your presence. Even though you will be farther away from your subject, you still want your picture will be as sharp as possible. Whether you are working with a digital format or film, a 35mm SLR or a 2 1/4 large-format camera, the lens is what makes the photo.
Instructions
1. Research your possibilities. Not all lenses fit all cameras. Know the camera you have and explore what options are available. Keep in mind that some lenses will fit multiple brands with the simple addition of a converter ring. This may open up your options somewhat, but you will need to add the cost of any conversion rings to the price you are willing to pay for your lens. The best place to start is with any of the popular photography magazines or the Internet. Both will not only give you what accessories are available for your camera, but they also should show photos taken with each lens described.
2. Decide what factor zoom you want. There are basically 2 types of zoom lenses. Some only go to a specific distance, such as a 150mm lens or a 250mm lens; and some span a number of distances, such as the 50 to 150mm lens. In this category, there are also lenses that provide macro and wide-angle capabilities, as with a 28-150mm lens. Consider what you will be shooting with the lens. Many photographers lean towards the multiple range capability, rather than purchasing 2 or 3 lenses with different capabilities.
3. Test the lens. If possible, before you purchase any lens, you should try it first. Find a store in your area that handles the lens you are thinking of purchasing. Attach the lens to your camera and take a couple of pictures with it, using all the capabilities it contains. This means that if you are looking at a 28-150mm lens with macro, you want to make sure you take photos using the macro feature, as well as pictures at 50, 75, 100 and 150 distances. If you are shooting digital, you will be able to see the results immediately. With film you will need to process the roll before purchasing your lens. Check the prints for clarity and sharpness.
4. Check the quality of the lens itself. Confirm that all the dials, rings, attachments, buttons, and so forth are tight with no slack. Focus the lens at the closest distance and turn it vertically with the lens facing down. Do you see the lens begin to slide? Is the focus twisting without you moving it. This shows that if you were to be photographing an object that is angled either up or down, the subject would become out of focus as the lens begins to shift all by itself.
Many of the larger zoom lenses will need a tripod to assist with the weight of the lens. Consider how heavy the lens is and whether you will be able to hold it steady while shooting. If not, will it need a separate tripod attached to it to hold it straight, or will a camera mounted tripod be able to handle the weight?
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