For­get­ting to fix lens prob­lems

NPhoto - - Special Feature -

Lens dis­tor­tion can cre­ate a myr­iad of prob­lems, so make this the first ad­just­ment you ap­ply when you process an im­age. If you don’t fix dis­tor­tion, then images may not ap­pear as sharp; lines that should ap­pear straight, such as the hori­zon, will ap­pear to bow; and the cor­ners of an im­age may be darker than its cen­tre.

You can ap­ply some lens cor­rec­tions in-cam­era, such as us­ing Vi­gnette Con­trol to re­duce the amount of cor­ner-shad­ing a lens ex­hibits (typ­i­cally a prob­lem with fast lenses), but car­ry­ing out the ad­just­ments post-shoot gives you more con­trol. If you do plan to ap­ply lens cor­rec­tions, then com­pose wider than nor­mal, par­tic­u­larly with a wide-an­gle lens, as the stretch­ing and crop­ping that oc­curs can slice a sur­pris­ing amount from the edge of the pic­ture.

Chro­matic aber­ra­tion (colour fring­ing) can be ob­vi­ous along edges in high-con­trast shots, but it’s easy to re­move au­to­mat­i­cally in Light­room and Pho­to­shop, which have lens pro­files al­ready built in

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