www.microglobe.co.uk Although many zoom lenses are labeled as macro that designation generally refers only to moderately close focusing ability. With a few exceptions, such zooms are not adequate for a dramatic frame-filling image unless the subject is quite large. (A few tele macro zoom lenses are capable of much higher magnification, however.) On the other hand, true macro lenses can focus extremely close, for very high magnification. And, because theyre optimized for great sharpness in extreme close focusing, they can provide superior image quality. A few macro lenses are designed only for moderate 0.5x magnification, but most can produce full 1x magnification, also called a 1:1 reproduction ratio. The new Tokina AT-X 100mm f/2.8 PRO D lens falls into the 1x category. A special helicoid shifts internal elements, moving the optical center further from the film plane—closer to the subject—for greater magnification. When focused to 11.8 it can reproduce a tiny subject as life size on a 35mm film frame or a full-frame digital sensor. Mount the lens on a digital camera with a smaller sensor and it provides higher apparent magnification, as discussed in our Magnification Issues sidebar.
Tags: Tokina, 100mm, F2, PRO, ATX, Macro, Lens, Nikon, Canon, Digital, Cameras, Photography, Review, Photographic, London, UK
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