Zoom­ing the lens af­ter you fo­cus

NPhoto - - Special Feature -

Most of the zoom lenses made to­day aren’t in fact true zooms, or what are known as ‘par­fo­cal’ lenses; rather, they’re ‘var­i­fo­cal’ lenses. One of the draw­backs of this type of de­sign is that the fo­cus shifts as the lens is zoomed. This means that if you zoom in to lock the fo­cus on a de­tail within a scene and then zoom back out to take a shot, there’s a good chance that the de­tail you want to ap­pear sharp will now be blurred. If the zoom range isn’t too great, the change in fo­cus may be sub­tle. Us­ing a small aper­ture to give a large depth of field – the amount of front-to-back sharp­ness in a pic­ture – can also mask any fo­cus shift. But the eas­i­est way to pre­vent this is to get into the habit of only fo­cus­ing af­ter you’ve zoomed. Once it be­comes part of your shoot­ing regime you won’t even have to think about it.

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