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[W698]Which Lens To Use
by Gary Bunn, Gar
Arguably the most important weapon in a photographers' arsenal, lenses are also one of the most variable. From the widest 10mm fish-eye to the longest 800mm telephoto, optics are available in every conceivable size, weight and focal length. Due to the smaller sensors used in many of today's digital SLRs, however, focal lengths vary depending on the model in question. See the previous page for more lens/focal length advice. But whether you're a landscaper looking to capture dramatic sunsets or an architectural fanatic looking to isolate fine details, there's a multitude of options that fall into four categories. Here's the low-down.

Standard
On full-frame digital SLRs standard lenses fall between 40mm and 55mm, though 50mm is the accepted norm. You'll need a 35mm lens to get the same field-of-view on digital SLRs with the smaller APS-sized sensor. Closest to the field-of-view of the human eye, standard lenses offer an undistorted perspective and are often used for flattering portraits. Just for the record, the true field-of-view of the human eye is 43mm!

Wide-angle
With shorter focal lengths and wider angles-of-view than standard lenses, wide-angle lenses are employed by landscape and reportage specialists. Remember you'll need a shorter focal length on many digital SLRs than a 35mm or full-frame digital model. This need for shorter focal lengths on many digital SLRs has produced a raft of new models. A 17-35mm model, such as the one shown below, gives a field-of-view equivalent to 25-52mm on a full-frame SLR.

Macro
If you've ever wondered how photographers fill the frame with small subjects such as petals and insects, the answer is the humble macro lens. Allowing for 1:1 (life-size) reproduction and focusing from as close as 2in, true macro lenses are specifically constructed for close-up photography. They are commonly available in focal lengths between 50mm and 180mm.

Telephoto
Any lens that weighs in with a focal length above 50mm is said to be a telephoto lens. Short telephotos (between 70mm and 120mm) are ideal for portraiture, while longer focal lengths (between 135mm and 300mm and above) are perfect for sports and wildlife. Remember, the magnification of a lens on most digital SLRs is increased by around 1.5x, so a 200mm lens is equivalent to a 300mm on a full-frame camera.

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Of course, it goes without saying that it is very important for a person who wears contact lenses to maintain ready access to a backup pair of contact lenses or glasses. But, again, even though this is a basic commonsense principle, it is striking how few people follow through in making sure that they do have a backup pair of contact lenses or glasses.

Most eye health experts maintain that it is not health to wear contact lenses all of the time. In other words, it is important for people to relieve their eyes of their contact lenses from time to time. This can only be accomplished if a person has a backup pair of eyeglasses available to them.

In addition, there are a wide array of different situations that can occur which will prevent a person from wearing contact lenses. For example, if you are afflicted with an eye infection, you likely will not be able to wear your contact lenses. Your only recourse will be able to wear a pair of eyeglasses.

Although many people do have a spare pair of eyeglasses lying around, or an extra pair of contact lenses, many of these same people will take of in a trip -- either for business or pleasure -- and leave the extra pair of contact lenses or spare glasses behind. Truly, this is a mistake. A person who wears contact lenses should never leave home without a spare pair of glasses or an extra pair of contact lenses. One point that a traveler needs to keep in mind is the fact that the climate and related conditions that exist in a locale to which her or she is traveling may be markedly different from home. Due to this difference, it may actually be impossible to wear contact lenses -- they may irritate a person's eyes significantly and severely, requiring their removal.

If you are a contact lens wearer, make sure that you have a backup pair of contact lenses and glasses readily available. Indeed, your best option really is to make sure that you have a pair of backup eyeglasses readily available -- whether you are at home or on the road.

Article Source : Creative Studio Of Photography

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Both Gary Bunn & Linda Polansky are contributors for EditorialToday. The above articles have been edited for relevancy and timeliness. All write-ups, reviews, tips and guides published by EditorialToday.com and its partners or affiliates are for informational purposes only. They should not be used for any legal or any other type of advice. We do not endorse any author, contributor, writer or article posted by our team.

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