By Ross Noddinott

Should you purchase a electronic SLR, you're not easily buying a digicam, yet making an investment in a complete “system.” one of many largest merits of a unmarried lens refl ex (SLR) digital camera, in comparison with a electronic compact, is the power to alter lenses. this enables photographers to pick the lens and focal size most fitted to the topic or situation—this unmatched flexibility makes an SLR the fitting selection for rookies, fanatics, and pros alike.

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Extra resources for Lenses For Digital SLRs

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Image sensors tend to reflect a certain amount of light. Internal reflections bounce off the elements and inside of the lens barrel before finding their way to the sensor, reducing contrast and sharpness and introducing flare and ghosting. Lens coatings (see page 62) help THE SKELETON OF A LENS The interior of any lens, however basic, is complex. All the elements have to work together in perfect technological harmony, allowing the photographer to concentrate on creating the best image possible.

Indd 35 35 5/9/11 10:29:09 least amount of light through—is the minimum aperture. 6. This indicates that the lens’s maximum aperture changes as you alter focal length. F-numbers can cause confusion. 8 or f/4; and a small f-stop—when the aperture is closed down—is indicated by a large figure, like f/22 or f/32. This may appear to be the opposite way round to what you would imagine. Therefore—to help you remember which value is bigger or smaller—it can be helpful to think of f-numbers in terms of fractions—for example, 1⁄8 (f/8) is smaller than ¼ (f/4).

For example, some DSLR lenses also include Image Stabilizing (see page 64) as an option, or are designed with a tripod collar (see page 53). 4 Aperture ring The aperture ring is linked mechanically to the lens diaphragm to allow the aperture to be set manually. However, few lenses today still feature an aperture ring, since aperture selection is typically made via the camera itself. 5 Lens mount/contacts The vast majority of optics are designed with a thread, of a certain diameter, at the end of the lens barrel.

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