13 Aut­o­fo­cus ad­vances

NPhoto - - Special Feature -

The D7500 uses the 51-point Multi-CAM 3500 II aut­o­fo­cus unit pre­vi­ously found in all of Nikon’s top DSLRs. By our reck­on­ing, this is one of the long­est-run­ning com­po­nents in Nikon’s whole DSLR range, but it’s been con­tin­u­ally up­dated over the years. Nikon has now in­tro­duced a new 153-point AF sen­sor in its top D500 and D5 mod­els, but the new and im­proved ver­sion of the Multi-CAM 3500 II in the D7500 should be worth hav­ing.

For the D7500, Nikon has added its new Group-area AF mode, de­signed to make it eas­ier to track er­rat­i­cally mov­ing sub­jects. Nikon’s ex­ist­ing Dy­namic-area AF mode looks sim­i­lar, but re­lies on you keep­ing your cho­sen fo­cus point over your sub­ject. Group-area AF is more for­giv­ing – it uses a group of five aut­o­fo­cus points in a ‘di­a­mond’ shape and fo­cuses on the ob­ject near­est the cam­era within that area.

Nikon has also added an Auto AF fine-tune op­tion. This is de­signed to com­pen­sate for small fo­cus dis­crep­an­cies some­times seen with cer­tain lens and cam­era body com­bi­na­tions. These hap­pen be­cause the aut­o­fo­cus sen­sor op­er­ates in­de­pen­dently of the cam­era’s imag­ing sen­sor. In the past, the AF fine-tune op­tion had to be cal­i­brated man­u­ally us­ing fid­dly test tar­gets; the D7500, how­ever, can use its Live View mode to au­to­mat­i­cally mea­sure and cor­rect fo­cus er­rors.

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