Cam­era and lens cor­rec­tions

Ge­orge Cairns demon­strates how to coun­ter­act arte­facts pro­duced by your Nikon’s lens

NPhoto - - Nikopedia -

There are a range of arte­facts that your Nikon’s lens can add to a pho­to­graph. Even the most ex­pen­sive lenses can pro­duce some geo­met­ric dis­tor­tion. As light is fo­cused through the lens onto your Nikon’s sen­sor it can cause hor­i­zon­tal and ver­ti­cal lines to bulge (or bar­rel) out­wards in the cap­tured im­age, or bulge in­wards as pin­cush­ion dis­tor­tion. In gen­eral, this geo­met­ric dis­tor­tion is sub­tle and you’ll only no­tice it when tog­gling the cor­rec­tion on and off (as you’ll see in our ac­com­pa­ny­ing video les­son).

Dif­fer­ent amounts of light can en­ter the lens at the edge of the frame, too. This un­even ex­po­sure can cause the edges of the photo to be­come vi­gnetted and ap­pear darker than the rest of the im­age.

While geo­met­ric dis­tor­tion and vi­gnetting can be sub­tle, lensin­duced arte­facts, such as chro­matic aber­ra­tion (colour fring­ing), may prove to be more un­sightly. For­tu­nately, Cap­ture NX-D can read a photo’s meta­data, dis­cover what lens and set­tings were used and then coun­ter­act dis­tor­tions and colour fring­ing to cre­ate a more ac­cu­rate rep­re­sen­ta­tion of the sub­ject.

When shoot­ing a tall sub­ject from a low an­gle, like our church, you’ll no­tice the walls ap­pear to con­verge to­wards the top of the frame. Cap­ture NX-D can also coun­ter­act this per­spec­ti­val dis­tor­tion.

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