Full-frame 4K Video

Typ­i­cal 4K video crop

NPhoto - - Full Test -

The abil­ity for a new model of DSLR to shoot 4K UHD video (3840x2160) is now al­most taken for granted, and in that sense the Nikon D850 is no dif­fer­ent. How­ever, most DSLRs don’t ac­tu­ally use the full sen­sor area when record­ing 4K video, crop­ping into the cen­tre of the frame in­stead, as rep­re­sented by the rec­tan­gle in the im­age above. This changes the ef­fec­tive fo­cal length of the lens be­ing used, and can cause a real headache when it comes to cal­cu­lat­ing crop fac­tors and the like. The D850, though, uses the full sen­sor area: shoot­ing with any given lens, the field of view for 4K video will be ex­actly the same as the field of view for a still im­age.

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