The Lens tab (press Ctrl+Alt+3 or ^+Option+3 on a Mac) gives the photographer the power to correct imperfections that can occur due to lens shortcomings. (Ack, wait! Don't go throwing away your digital camera or the lenses you bought for your digital SLR! The fact of the matter is that almost all lenses display chromatic aberrations or vignetting from time to time.)
As a rule, lens shortcomings appear when you adjust your zoom to either the extreme wide-angle or telephoto settings — or when the lens aperture is either wide open or closed down. Today's compact and prosumer model digital cameras come equipped with lenses of excellent quality, and they only keep getting better.
If you're going to be making large prints from your digital images or cropping to extremes, the controls in the Lens tab (shown in Figure 9-24) may come in handy. These are the controls for those ever-so-slight adjustments that make your images that much closer to perfect.
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Although we usually tend to think of the digital camera as the best thing since sliced bread, there are both pros and cons with its use. Nothing is available on the market that does not have both a good and a bad side, but the key is to weigh the good against the bad in order to come up with the best of both worlds.