The tests ex­plained!

We test lenses to their lim­its in three key ar­eas of op­ti­cal per­for­mance – sharp­ness, colour fring­ing and dis­tor­tion

NPhoto - - Test Team -

Sharp­ness (high scores are bet­ter)

Fig­ures are based on the Imat­est SFRPlus chart. For an even play­ing field, cen­tre, mid and edge sharp­ness was checked for all lenses us­ing the same D610 body.

Fring­ing (low scores are bet­ter)

Colour fring­ing tends to be worst at the cor­ners of the frame. To high­light how fring­ing af­fects each lens the Imat­est SFRPlus chart was shot us­ing a D610.

Dis­tor­tion (close to 0 is best)

Dis­tor­tions are a com­mon trait of wide-an­gled lenses, es­pe­cially bar­rel dis­tor­tion. Each lens was tested at its widest fo­cal length on the D610.

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